The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  2  1
 0  2  0  0  2  2 2a 2a^2 2a^2+2a 2a^2+2a+2 2a^2+2a+2  2 2a^2+2a+2  0 2a 2a^2+2a  2  0
 0  0  2  0 2a^2+2 2a^2+2a+2 2a 2a^2+2 2a^2+2 2a 2a^2+2 2a^2 2a 2a^2+2a+2 2a 2a 2a^2+2a  2
 0  0  0  2  2 2a^2+2a 2a^2+2a  2 2a^2+2 2a^2+2a 2a^2+2 2a^2+2 2a+2  2  2  0 2a^2 2a^2+2

generates a code of length 18 over GR(64,4) who´s minimum homogenous weight is 104.

Homogenous weight enumerator: w(x)=1x^0+224x^104+686x^112+3584x^119+784x^120+25088x^127+931x^128+1120x^136+350x^144

The gray image is a code over GF(8) with n=144, k=5 and d=104.
This code was found by Heurico 1.16 in 0.135 seconds.