The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  8  2  2  2  0  2  1  8  1  1  0  1  8  1  2  1  1  1  2  1  1  0  2  1  0  1  1  1  2  0  2  1  2  2  1  1  2  1  4  2  1  0  1 12  2  2  1
 0  2  0  6  0  6  8 10  8  6  8  2 14  8  2  8  8  8  6 10 10  2 12  0  0 12 10 10  2 14  6 14  2 14 10  2  8 14  2  4  2 14  2 10 10 12  2  8 10  2  6  4  2  6 12  8  2  4  8 10 10 14  4 12 14  6  2  4  4  4  2  2  2  8  0
 0  0 12  0  0  0 12  0  0  0  8  8  0  8  8  8  0  8 12 12  4  4 12 12 12 12  4 12  0  0 12  4  4 12 12  4 12  4  4 12  4  4 12  0 12 12  8  4 12 12  0  0 12  0  4  0  0  8  4  4  4  8  4 12  4 12  8  8 12  8 12  0  4  0  8
 0  0  0 12  0  0  0  4  0  0  0  0  4  4 12 12 12  4 12  4  8  8  4  4  4  8 12 12  8 12  4  8  4  0  0  4 12  0  0  0 12  8 12  4 12  0 12  8  4  8  8 12  4  4 12  0 12  8 12  0  4  4  4  0  8  4  4  4 12  0  4 12  0  8  8
 0  0  0  0 12  0  4  0  8  4  4  4 12  4 12  0 12  8  8 12  0 12 12  8  8 12  8 12 12  4  4  4  0  0  0  8  4 12 12  4 12  4  0 12  4  8  4  8  8 12 12  4  0 12 12  4  8  4 12  8 12  0  0  0  8  0 12  0  0  4  0 12  0  8  0
 0  0  0  0  0 12  0 12 12  4  4  0  8 12 12 12  8  0  8  4 12  4 12 12  0 12  4  0  0 12 12  4  8  8  8  4  8  0  8 12  8  8 12  8  8  8  4  4  4  0  0  8 12 12 12  8  0  4 12  4  4  8  0  4 12  0 12  0 12  8  0  8  0  4  0

generates a code of length 75 over Z16 who´s minimum homogenous weight is 64.

Homogenous weight enumerator: w(x)=1x^0+35x^64+124x^65+231x^66+308x^67+594x^68+734x^69+1035x^70+1772x^71+2583x^72+3296x^73+3607x^74+4048x^75+3984x^76+3244x^77+2532x^78+1684x^79+989x^80+744x^81+454x^82+244x^83+191x^84+94x^85+93x^86+56x^87+32x^88+20x^89+15x^90+16x^91+7x^92+1x^98

The gray image is a code over GF(2) with n=600, k=15 and d=256.
This code was found by Heurico 1.16 in 26.8 seconds.