The generator matrix

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

generates a code of length 18 over F8[X]/(X^2) who´s minimum homogenous weight is 112.

Homogenous weight enumerator: w(x)=1x^0+385x^112+336x^114+896x^119+4928x^120+1120x^122+6272x^127+16569x^128+2128x^130+56x^136+77x^144

The gray image is a linear code over GF(8) with n=144, k=5 and d=112.
This code was found by Heurico 1.16 in 0.0545 seconds.