The generator matrix

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

generates a code of length 21 over Z8 who´s minimum homogenous weight is 13.

Homogenous weight enumerator: w(x)=1x^0+34x^13+145x^14+238x^15+509x^16+870x^17+2558x^18+2818x^19+6995x^20+4338x^21+7048x^22+2870x^23+2628x^24+866x^25+466x^26+214x^27+100x^28+36x^29+23x^30+4x^31+6x^32+1x^36

The gray image is a code over GF(2) with n=84, k=15 and d=26.
This code was found by Heurico 1.16 in 5.92 seconds.