The generator matrix

 1  0  0  1  1  1  X  1  1  X  0  1  1  0  0  1  1  1  1  1  1
 0  1  0  1  0  1  1  0  1  1  X  0 X+1  X  1  1  1  1 X+1  X  X
 0  0  1  1  1  0  1  0 X+1  X  1  0  X  1  0 X+1  0  X  X  1  1
 0  0  0  X  0  0  0  0  X  0  X  X  X  0  X  X  X  0  0  0  0
 0  0  0  0  X  0  0  X  X  X  0  X  X  X  0  X  0  0  0  0  0
 0  0  0  0  0  X  0  X  X  X  X  0  X  0  0  0  X  0  X  0  0

generates a code of length 21 over Z2[X]/(X^2) who´s minimum homogenous weight is 16.

Homogenous weight enumerator: w(x)=1x^0+55x^16+104x^18+102x^20+112x^22+72x^24+40x^26+26x^28

The gray image is a linear code over GF(2) with n=42, k=9 and d=16.
This code was found by Heurico 1.16 in -6.48e-008 seconds.