The generator matrix

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

generates a code of length 96 over GR(16,4) who´s minimum homogenous weight is 284.

Homogenous weight enumerator: w(x)=1x^0+162x^284+96x^285+144x^286+117x^288+288x^289+144x^292+48x^294+12x^296+6x^304+6x^316

The gray image is a code over GF(4) with n=384, k=5 and d=284.
This code was found by Heurico 1.16 in 0.188 seconds.