The generator matrix

 1  0  1  1  1  6  1  1  8  1  1 14  8  1  1  6  1  1  1  0  1  6  1  1  1  4  1  1  1  1  1 10  0  1  1  1 10  2  1  1  1  1  4 14  1  0  1  1 14  1  1  1  2 14  1  8  1  1  1  1  1  2  2  1  4  4  4  1  1  8 12 12  2  2
 0  1 11  6  1  1  0 11  1  6 13  1  1  3  8  1  9  6 15  1  6  1  5  0  1  1  0 11 13 14  0  1  1 15  6  9  1  1  3  4 14  1  1  1  2  1  2 13  1  0 11  0  1  1  9  1  5  8  8 12  4 12  1  5  1  1  1  0  7  1  1  1 10  8
 0  0 12  0  0  0  0  0  0  0  4  8 12  8 12 12 12 12  4 12 12 12  4  0  0  8 12 12  8  8  0  4  8  8  4  0  4  8 12  4  4  4  0  4  8  0  8  0  8  4  8 12 12  8  4  0 12  0  4  8 12 12  0  0 12 12  4  4  0 12 12  8  4  4
 0  0  0 12  0  0 12  8  0  0  0  0  0 12 12 12  4  8  4  4  8  0  8  4  4  4  4 12  4  8  0  8 12  8 12  0  4  0  8 12  4  0 12 12  4  8  8 12  4  0  8  4  0 12  8  8 12 12 12  0  4 12 12  8  8  0  0  4  8  4  4  0 12  0
 0  0  0  0  4  0  0 12 12  8  8 12  8  4  4  8  0 12  0  0 12 12 12  4  0  8  8 12  0 12 12  4 12  0  8  8  0 12  4  4 12  8  8  4  8  8 12  4 12 12  4  0  8  8  8 12  8 12  0  4 12  8  4  8  8  0  0  0  8  0 12  8  0  8
 0  0  0  0  0  8  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  8  8  8  8  8  8  8  8  8  8  8  8  8  8  8  8  8  8  8  8  8  8  8  8  8  8  8  0  8  8  0  0  0  8  0  0  8  0
 0  0  0  0  0  0  8  8  0  8  8  8  0  0  8  0  0  0  8  8  8  8  0  8  0  0  0  0  8  0  8  0  0  8  8  0  8  8  8  8  0  0  0  0  8  8  8  0  0  0  8  0  8  8  8  0  8  0  8  0  8  8  8  0  8  0  8  8  8  0  8  0  0  0

generates a code of length 74 over Z16 who´s minimum homogenous weight is 64.

Homogenous weight enumerator: w(x)=1x^0+163x^64+40x^65+528x^66+460x^67+1431x^68+1712x^69+3504x^70+4740x^71+7078x^72+8448x^73+9336x^74+8388x^75+7416x^76+4696x^77+3480x^78+1724x^79+1153x^80+456x^81+394x^82+48x^83+172x^84+8x^85+86x^86+52x^88+14x^90+4x^92+2x^94+1x^96+1x^100

The gray image is a code over GF(2) with n=592, k=16 and d=256.
This code was found by Heurico 1.16 in 64.5 seconds.