The generator matrix

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

generates a code of length 73 over Z16 who´s minimum homogenous weight is 64.

Homogenous weight enumerator: w(x)=1x^0+138x^64+984x^65+2348x^66+5746x^67+9194x^68+14290x^69+20769x^70+28226x^71+31370x^72+34920x^73+32652x^74+28844x^75+20881x^76+14302x^77+8618x^78+5076x^79+2085x^80+982x^81+333x^82+214x^83+99x^84+40x^85+15x^86+4x^87+8x^88+2x^89+1x^90+2x^95

The gray image is a code over GF(2) with n=584, k=18 and d=256.
This code was found by Heurico 1.16 in 691 seconds.