The generator matrix

 1  0  1  1  1  1  1  0  1  1  1  1  1
 0  1  1  8  0  7  8  1  0  0  3  3  0
 0  0  6  0  0  6  6  3  0  3  6  3  0
 0  0  0  3  0  6  0  6  6  6  6  3  0
 0  0  0  0  3  6  3  6  3  3  0  6  0

generates a code of length 13 over Z9 who´s minimum homogenous weight is 18.

Homogenous weight enumerator: w(x)=1x^0+66x^18+120x^21+162x^22+144x^24+648x^25+158x^27+648x^28+132x^30+108x^33

The gray image is a code over GF(3) with n=39, k=7 and d=18.
This code was found by Heurico 1.16 in 0.0073 seconds.