The generator matrix

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

generates a code of length 92 over GR(16,4) who´s minimum homogenous weight is 259.

Homogenous weight enumerator: w(x)=1x^0+432x^259+540x^260+792x^261+660x^262+1872x^263+1473x^264+1800x^265+1572x^266+2364x^267+2175x^268+2064x^269+2160x^270+3528x^271+2553x^272+2304x^273+1932x^274+3624x^275+3033x^276+2556x^277+2028x^278+3564x^279+2580x^280+2448x^281+1680x^282+2808x^283+2001x^284+1980x^285+1284x^286+1932x^287+1323x^288+996x^289+696x^290+948x^291+543x^292+336x^293+252x^294+384x^295+147x^296+84x^297+24x^298+48x^299+12x^300+3x^304

The gray image is a code over GF(4) with n=368, k=8 and d=259.
This code was found by Heurico 1.16 in 29.9 seconds.