The generator matrix

 1  0  1  1  1  1  1  1  1  0  1  1  1  1  0  1  1  1  1  2  1  1  1  1  2  1  1  2  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  1  1  1  1  1  1  1  1  1  1  0 2a+2  2  0 2a+2  2 2a 2a+2 2a+2 2a+2  1  1  1  1  1  1  1  1  1  2  1
 0  1  1  a a+1  0 2a+3  a a+1  1  0  a 2a+3 a+1  1  2 2a+3 a+2 a+3  1  2  1 a+2 a+3  1  2 2a+1  1  0 3a+2 a+3 2a+3 a+2  2 2a  3 a+2 2a+1 3a+2 2a+1  a  2  1 3a+2 2a 2a+1  1  1  a 2a+1 a+2 3a+2 2a+3 3a 3a+2 a+1 a+3 a+1 a+3 3a+1 3a+3  2  0  0 2a 2a  1  1  1  1  1  1  1  1  1  1 a+1 3a+1 3a+1 3a+1 3a+1 3a+3 a+3 a+3 3a+3  2 a+1
 0  0 2a+2  0  2  0  2 2a 2a 2a 2a  2 2a+2 2a+2  0 2a+2  0 2a+2  0  2  2 2a 2a  2 2a+2 2a  2 2a 2a+2  2  0  2  2 2a+2  0 2a+2 2a 2a+2  0 2a 2a 2a  0 2a+2  2  2 2a  0  0 2a 2a+2 2a+2  0  2  0 2a 2a+2  2 2a+2  0 2a  2  0  2 2a 2a+2  2  2 2a+2 2a  0 2a  2 2a+2 2a+2  0 2a+2  0 2a 2a+2 2a 2a+2  2  0  0  0 2a
 0  0  0  2 2a 2a  0 2a  2  2  0  2 2a  2  2  0  0  2  2  2  0  0  2  2  2 2a 2a  0 2a 2a 2a  2 2a+2 2a+2 2a+2  2 2a+2 2a+2 2a+2  2  0 2a+2  2 2a+2 2a+2 2a+2 2a+2 2a+2 2a 2a  0 2a 2a  0  0 2a 2a 2a+2 2a+2 2a+2 2a+2 2a  2  2  2  2 2a 2a+2 2a+2 2a 2a 2a+2  0  0 2a 2a+2 2a+2  2 2a+2  0  0  2  0  0 2a  0 2a

generates a code of length 87 over GR(16,4) who´s minimum homogenous weight is 254.

Homogenous weight enumerator: w(x)=1x^0+816x^254+615x^256+1152x^258+336x^262+216x^264+336x^270+120x^272+384x^274+48x^278+72x^280

The gray image is a code over GF(4) with n=348, k=6 and d=254.
This code was found by Heurico 1.16 in 72.8 seconds.