The generator matrix

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

generates a code of length 21 over Z2[X]/(X^2) who´s minimum homogenous weight is 14.

Homogenous weight enumerator: w(x)=1x^0+242x^14+737x^16+1209x^18+1796x^20+2024x^22+1362x^24+574x^26+196x^28+46x^30+4x^32+1x^34

The gray image is a linear code over GF(2) with n=42, k=13 and d=14.
As d=14 is an upper bound for linear (42,13,2)-codes, this code is optimal over Z2[X]/(X^2) for dimension 13.
This code was found by Heurico 1.16 in 2.69 seconds.