The generator matrix

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

generates a code of length 54 over GR(16,4) who´s minimum homogenous weight is 155.

Homogenous weight enumerator: w(x)=1x^0+540x^155+375x^156+96x^157+216x^158+552x^159+342x^160+24x^161+228x^162+384x^163+243x^164+24x^165+72x^166+252x^167+93x^168+24x^169+36x^170+300x^171+60x^172+24x^173+24x^174+84x^175+96x^176+6x^180

The gray image is a code over GF(4) with n=216, k=6 and d=155.
This code was found by Heurico 1.16 in 67.5 seconds.