The generator matrix

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

generates a code of length 99 over GR(16,4) who´s minimum homogenous weight is 284.

Homogenous weight enumerator: w(x)=1x^0+252x^284+672x^285+264x^286+300x^287+921x^288+1308x^289+552x^290+588x^291+816x^292+1344x^293+444x^294+408x^295+840x^296+1044x^297+276x^298+288x^299+765x^300+864x^301+252x^302+336x^303+525x^304+756x^305+216x^306+192x^307+315x^308+384x^309+144x^310+156x^311+270x^312+300x^313+144x^314+36x^315+111x^316+192x^317+27x^320+48x^321+12x^322+21x^324

The gray image is a code over GF(4) with n=396, k=7 and d=284.
This code was found by Heurico 1.16 in 1.81 seconds.