The generator matrix

 1  0  1  1  1  1  1  1  1  0  1  1  1  1  X  1  1  1  1  X  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  X  1  1
 0  1  1  a a^2*X+a^2  0 a^2*X+1 a^2*X+a^2  a  1 a*X+a^2  X a^2*X+1 X+a  1  X  1 X+a a*X+a^2  1  0  X a^2*X+1 a*X+1 a*X+1 a*X a*X  a X+a a*X+a a*X+a a*X+1 a^2*X+a^2 a*X+a^2 X+a^2 X+a^2 a*X  1 a*X+a X+a^2  0  X a*X+1 a^2*X+1  a X+a a^2 a^2 a^2*X a*X  1
 0  0 a^2*X a*X  X  X  0 a^2*X  0 a*X a*X a^2*X a*X  X  X a*X  X a^2*X  0 a^2*X a*X  X  X a^2*X  0  0 a^2*X  X a*X  0 a^2*X a*X  0 a^2*X  X a*X  X  0  X  0 a^2*X  0  X a^2*X a^2*X  0 a^2*X  X a*X a*X a*X

generates a code of length 51 over F4[X]/(X^2) who´s minimum homogenous weight is 149.

Homogenous weight enumerator: w(x)=1x^0+120x^149+288x^150+33x^152+192x^153+192x^154+24x^156+48x^157+72x^158+3x^160+24x^165+24x^166+3x^184

The gray image is a linear code over GF(4) with n=204, k=5 and d=149.
This code was found by Heurico 1.16 in 0.641 seconds.