Had mx of order 16 from Hedayat - Wallis p 1222
0000000000000000
0001011100010111
0100101101001011
0110010101100101
0111001001110010
0011100100111001
0101110001011100
0010111000101110
0000000011111111
0011001111001100
0101010110101010
0110011010011001
0000111111110000
0011110011000011
0101101010100101
0110100110010110