The generator matrix

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

generates a code of length 54 over GR(16,4) who´s minimum homogenous weight is 153.

Homogenous weight enumerator: w(x)=1x^0+432x^153+372x^156+636x^157+186x^160+684x^161+186x^164+612x^165+156x^168+468x^169+99x^172+240x^173+3x^176+12x^180+6x^184+3x^188

The gray image is a code over GF(4) with n=216, k=6 and d=153.
This code was found by Heurico 1.16 in 1.2 seconds.