The generator matrix

 1  1  1  1  1  1  1  1  2  2  2  2  2  2  2  2  1  1
 0  2  0  0  0  2  2  2  0  0  0  2  2  2  2  0  0  0
 0  0  2  0  2  2  2  0  0  2  2  2  2  0  0  0  0  0
 0  0  0  2  2  0  2  2  2  2  0  0  2  2  0  0  0  0

generates a code of length 18 over Z4 who´s minimum homogenous weight is 16.

Homogenous weight enumerator: w(x)=1x^0+7x^16+14x^18+8x^20+2x^26

The gray image is a code over GF(2) with n=36, k=5 and d=16.
This code was found by Heurico 1.16 in 0.000796 seconds.