The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  X  1  1  1  1  X
 0 X^3  0  0  0  0  0 X^3  0 X^3  0  0 X^3 X^3  0 X^3 X^3 X^3
 0  0 X^3  0  0  0 X^3 X^3  0 X^3  0 X^3  0 X^3 X^3 X^3  0  0
 0  0  0 X^3  0  0 X^3  0  0 X^3 X^3 X^3 X^3  0  0 X^3  0 X^3
 0  0  0  0 X^3  0 X^3  0 X^3 X^3 X^3  0  0 X^3  0 X^3 X^3  0
 0  0  0  0  0 X^3 X^3  0 X^3  0  0  0 X^3 X^3 X^3 X^3  0 X^3

generates a code of length 18 over Z2[X]/(X^4) who´s minimum homogenous weight is 16.

Homogenous weight enumerator: w(x)=1x^0+78x^16+384x^18+32x^20+16x^24+1x^32

The gray image is a linear code over GF(2) with n=144, k=9 and d=64.
This code was found by Heurico 1.16 in 0.016 seconds.