The generator matrix

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

generates a code of length 21 over Z4[X]/(X^3+2,2X) who´s minimum homogenous weight is 20.

Homogenous weight enumerator: w(x)=1x^0+6x^20+112x^21+6x^22+1x^24+1x^26+1x^34

The gray image is a code over GF(2) with n=168, k=7 and d=80.
This code was found by Heurico 1.16 in 3.81e-009 seconds.