The generator matrix

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

generates a code of length 64 over Z8 who´s minimum homogenous weight is 52.

Homogenous weight enumerator: w(x)=1x^0+31x^52+122x^53+220x^54+324x^55+555x^56+844x^57+1125x^58+1400x^59+1794x^60+2300x^61+2847x^62+3204x^63+3272x^64+3180x^65+2767x^66+2434x^67+1974x^68+1376x^69+1060x^70+710x^71+413x^72+314x^73+209x^74+110x^75+78x^76+50x^77+25x^78+10x^79+7x^80+6x^81+3x^82+3x^84

The gray image is a code over GF(2) with n=256, k=15 and d=104.
This code was found by Heurico 1.16 in 43.5 seconds.