The generator matrix

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

generates a code of length 54 over GR(16,4) who´s minimum homogenous weight is 152.

Homogenous weight enumerator: w(x)=1x^0+1530x^152+3372x^156+3780x^160+3144x^164+2640x^168+1452x^172+456x^176+6x^184+3x^192

The gray image is a code over GF(4) with n=216, k=7 and d=152.
This code was found by Heurico 1.16 in 39.1 seconds.