The generator matrix

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

generates a code of length 20 over Z4[X]/(X^2+2) who´s minimum homogenous weight is 18.

Homogenous weight enumerator: w(x)=1x^0+6x^18+16x^19+82x^20+14x^21+6x^22+1x^24+2x^29

The gray image is a code over GF(2) with n=160, k=7 and d=72.
This code was found by Heurico 1.16 in -1.01e-007 seconds.