The generator matrix

 1  0  1  1  1  6  1  1  4  1  1  2  1  1  1  1  1  1
 0  1  3  6  5  1  4  7  1  2  1  1  0  6  4  2  3  0

generates a code of length 18 over Z8 who´s minimum homogenous weight is 17.

Homogenous weight enumerator: w(x)=1x^0+12x^17+37x^18+12x^19+1x^26+1x^28

The gray image is a code over GF(2) with n=72, k=6 and d=34.
This code was found by Heurico 1.16 in 0.000851 seconds.