The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  X  1
 0  X  0  0  X  X a*X a^2*X a^4*X a^5*X a^5*X  X a^5*X  0 a*X a^4*X  X  0
 0  0  X  0 a^6*X a^5*X a*X a^6*X a^6*X a*X a^6*X a^2*X a*X a^5*X a*X a*X a^4*X  X
 0  0  0  X  X a^4*X a^4*X  X a^6*X a^4*X a^6*X a^6*X a^3*X  X  X  0 a^2*X a^6*X

generates a code of length 18 over F8[X]/(X^2) 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 linear code over GF(8) with n=144, k=5 and d=104.
This code was found by Heurico 1.16 in 0.134 seconds.