The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  X  X  1  1  1  1  X  X  1  1  1  X  X  1  X X^2  X  0  X  X X^2 X^3  1  1 X^2  1  X  X  1  X  X X^2  0 X^3 X^2 X^3 X^2  0 X^2  X  X X^3 X^2
 0 X^3+X^2 X^3 X^2  0 X^3+X^2 X^3 X^2  0 X^3+X^2 X^3 X^2  0 X^3+X^2 X^3 X^2  0 X^3+X^2 X^3 X^2 X^3+X^2 X^2  0 X^3+X^2 X^3 X^2 X^3+X^2 X^2  0 X^3 X^3+X^2  0 X^3 X^2 X^3+X^2 X^3+X^2 X^2 X^2  0 X^3 X^2 X^2  0 X^3 X^3 X^3+X^2  0 X^3 X^2 X^3+X^2 X^2 X^3+X^2 X^2 X^3  0 X^2 X^2 X^3 X^3  0 X^3  0  0

generates a code of length 63 over Z2[X]/(X^4) who´s minimum homogenous weight is 64.

Homogenous weight enumerator: w(x)=1x^0+63x^64

The gray image is a linear code over GF(2) with n=504, k=6 and d=256.
This code was found by Heurico 1.16 in 0.156 seconds.