The generator matrix

 1  0  0  1  1  1  6  1  6  1  1  2  1  2  1  2  4  1  1  1  6  0  1  6  1  1  1  6  1  4  1  0  0  1  1  1  4  1  0  1  2  1  4  1  6  1  1  1  1  1  1  4  1  1  1  1  4  1  4  1  6  1  2  1
 0  1  0  0  1  3  1  4  0  4  7  1  3  1  5  2  1  2  2  5  1  0  0  1  2  7  5  1  5  1  0  1  6  6  7  0  1  1  0  7  1  6  1  1  1  4  6  3  5  2  1  4  0  2  3  3  1  0  4  1  1  0  1  0
 0  0  1  1  3  0  3  3  1  2  3  2  2  1  1  1  2  6  3  6  6  1  6  1  3  7  6  4  7  1  4  7  1  1  4  5  6  6  1  7  7  2  6  0  3  7  0  5  3  1  1  1  0  6  5  1  3  3  1  2  2  6  4  0
 0  0  0  2  2  6  4  6  0  0  2  4  2  0  6  0  0  4  6  2  4  0  2  6  0  0  4  2  4  4  4  6  2  0  4  4  6  6  2  0  2  6  6  4  6  6  4  0  0  6  0  0  6  0  2  2  0  2  2  2  0  6  4  0
 0  0  0  0  4  0  0  4  4  4  0  4  4  0  0  4  0  0  0  0  4  0  4  4  4  0  0  0  4  4  4  0  4  4  4  0  4  4  0  4  0  0  0  0  0  4  4  0  4  4  0  4  4  0  4  0  0  0  0  4  0  0  4  4
 0  0  0  0  0  4  4  0  0  0  0  0  0  0  4  4  4  4  4  0  4  4  4  4  0  4  0  0  0  4  4  0  0  4  0  0  4  0  4  4  4  4  0  4  4  4  4  4  4  0  0  0  0  0  4  4  0  4  0  4  0  0  4  0

generates a code of length 64 over Z8 who´s minimum homogenous weight is 56.

Homogenous weight enumerator: w(x)=1x^0+59x^56+200x^57+309x^58+596x^59+479x^60+736x^61+710x^62+852x^63+645x^64+762x^65+569x^66+734x^67+418x^68+458x^69+225x^70+160x^71+105x^72+80x^73+34x^74+26x^75+19x^76+2x^77+9x^78+2x^80+2x^81

The gray image is a code over GF(2) with n=256, k=13 and d=112.
This code was found by Heurico 1.16 in 2.29 seconds.