The generator matrix

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

generates a code of length 18 over Z4[X]/(X^2+2) who´s minimum homogenous weight is 16.

Homogenous weight enumerator: w(x)=1x^0+15x^16+224x^18+15x^20+1x^36

The gray image is a code over GF(2) with n=144, k=8 and d=64.
This code was found by Heurico 1.16 in 6.87e-008 seconds.