Best double circulant found so far for 66

100000101000110011101101001111101011101001110000010111011110110101
110000010100011001110110100111110101110100111000001011101111011010
011000001010001100111011010011111010111010011100000101110111101101
101100000101000110011101101001111101011101001110000010111011110110
110110000010100011001110110100111010101110100111000001011101111011
111011000001010001100111011010011101010111010011100000101110111101
111101100000101000110011101101001110101011101001110000010111011110
111110110000010100011001110110100011010101110100111000001011101111
011111011000001010001100111011010101101010111010011100000101110111
001111101100000101000110011101101110110101011101001110000010111011
100111110110000010100011001110110111011010101110100111000001011101
010011111011000001010001100111011111101101010111010011100000101110
101001111101100000101000110011101011110110101011101001110000010111
110100111110110000010100011001110101111011010101110100111000001011
011010011111011000001010001100111110111101101010111010011100000101
101101001111101100000101000110011111011110110101011101001110000010
110110100111110110000010100011001011101111011010101110100111000001
111011010011111011000001010001100101110111101101010111010011100000
011101101001111101100000101000110010111011110110101011101001110000
001110110100111110110000010100011001011101111011010101110100111000
100111011010011111011000001010001000101110111101101010111010011100
110011101101001111101100000101000000010111011110110101011101001110
011001110110100111110110000010100000001011101111011010101110100111
001100111011010011111011000001010100000101110111101101010111010011
000110011101101001111101100000101110000010111011110110101011101001
100011001110110100111110110000010111000001011101111011010101110100
010001100111011010011111011000001011100000101110111101101010111010
101000110011101101001111101100000001110000010111011110110101011101
010100011001110110100111110110000100111000001011101111011010101110
001010001100111011010011111011000010011100000101110111101101010111
000101000110011101101001111101100101001110000010111011110110101011
000010100011001110110100111110110110100111000001011101111011010101
000001010001100111011010011111011111010011100000101110111101101010
010101101111011101000001110010111001000001101001000110011101011111
101010110111101110100000111001011100100000110100100011001110101111
110101011011110111010000011100101110010000011010010001100111010111
111010101101111011101000001110010111001000001101001000110011101011
011101010110111101110100000111001111100100000110100100011001110101
101110101011011110111010000011100111110010000011010010001100111010
010111010101101111011101000001110011111001000001101001000110011101
001011101010110111101110100000111101111100100000110100100011001110
100101110101011011110111010000011010111110010000011010010001100111
110010111010101101111011101000001101011111001000001101001000110011
111001011101010110111101110100000110101111100100000110100100011001
011100101110101011011110111010000111010111110010000011010010001100
001110010111010101101111011101000011101011111001000001101001000110
000111001011101010110111101110100001110101111100100000110100100011
000011100101110101011011110111010100111010111110010000011010010001
000001110010111010101101111011101110011101011111001000001101001000
100000111001011101010110111101110011001110101111100100000110100100
010000011100101110101011011110111001100111010111110010000011010010
101000001110010111010101101111011000110011101011111001000001101001
110100000111001011101010110111101100011001110101111100100000110100
111010000011100101110101011011110010001100111010111110010000011010
011101000001110010111010101101111001000110011101011111001000001101
101110100000111001011101010110111100100011001110101111100100000110
110111010000011100101110101011011010010001100111010111110010000011
111011101000001110010111010101101101001000110011101011111001000001
111101110100000111001011101010110110100100011001110101111100100000
011110111010000011100101110101011011010010001100111010111110010000
101111011101000001110010111010101001101001000110011101011111001000
110111101110100000111001011101010000110100100011001110101111100100
011011110111010000011100101110101000011010010001100111010111110010
101101111011101000001110010111010000001101001000110011101011111001
010110111101110100000111001011101100000110100100011001110101111100
101011011110111010000011100101110010000011010010001100111010111110

M M^T:

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 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 18 18 18 18 18 18 18 18 18 18 18 18 18 18 19 18 19 18 19 18 35 18 19 18 19 18 19 18 18 18 18 18 18
 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 19 18 19 18 19 18 35 18 19 18 19 18 19 18 18 18 18 18
 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 19 18 19 18 19 18 35 18 19 18 19 18 19 18 18 18 18
 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 19 18 19 18 19 18 35 18 19 18 19 18 19 18 18 18
 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 19 18 19 18 19 18 35 18 19 18 19 18 19 18 18
 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 19 18 19 18 19 18 35 18 19 18 19 18 19 18
 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 19 18 19 18 19 18 35 18 19 18 19 18 19
 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 19 18 19 18 19 18 35 18 19 18 19 18
 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 18 19 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 19 18 19 18 19 18 35 18 19 18 19
 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 18 19 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 19 18 19 18 19 18 35 18 19 18
 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 18 19 18 19 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 19 18 19 18 19 18 35 18 19
 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 18 19 18 19 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 19 18 19 18 19 18 35 18
 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 18 19 18 19 18 19 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 19 18 19 18 19 18 35

Determinant 114003009024834093029908264689724276392761 (1.14003e+41) set 2343 result 2.07669e+34
A = 16 B = 19 N = 33

 16  8  7  8  8  8  8  7  6  8  8  7  9  8  6  7  7
 19 10 12 10 11 10 11 11 12 10 10 11  9 10 12 11 11
 35 18 19 18 19 18 19 18 18 18 18 18 18 18 18 18 18