The generator matrix

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

generates a code of length 18 over Z2[X]/(X^4) who´s minimum homogenous weight is 15.

Homogenous weight enumerator: w(x)=1x^0+128x^15+506x^16+794x^17+1423x^18+584x^19+427x^20+178x^21+41x^22+12x^23+2x^24

The gray image is a linear code over GF(2) with n=144, k=12 and d=60.
This code was found by Heurico 1.16 in 0.125 seconds.