The generator matrix

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

generates a code of length 54 over GR(16,4) who´s minimum homogenous weight is 148.

Homogenous weight enumerator: w(x)=1x^0+318x^148+60x^149+192x^151+855x^152+384x^153+384x^155+1608x^156+504x^157+576x^159+2319x^160+672x^161+960x^163+2247x^164+780x^165+768x^167+1992x^168+576x^169+192x^171+678x^172+96x^173+96x^176+60x^180+24x^184+21x^188+6x^192+9x^196+3x^200+3x^204

The gray image is a code over GF(4) with n=216, k=7 and d=148.
This code was found by Heurico 1.16 in 1.21 seconds.