The generator matrix

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

generates a code of length 18 over Z8 who´s minimum homogenous weight is 13.

Homogenous weight enumerator: w(x)=1x^0+86x^13+334x^14+596x^15+966x^16+1362x^17+1459x^18+1386x^19+1074x^20+578x^21+220x^22+80x^23+39x^24+6x^25+3x^26+2x^27

The gray image is a code over GF(2) with n=72, k=13 and d=26.
This code was found by Heurico 1.16 in 31.3 seconds.