The generator matrix

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

generates a code of length 21 over Z8 who´s minimum homogenous weight is 18.

Homogenous weight enumerator: w(x)=1x^0+28x^18+108x^19+109x^20+100x^21+42x^22+54x^23+26x^24+24x^25+17x^26+2x^27+1x^30

The gray image is a code over GF(2) with n=84, k=9 and d=36.
This code was found by Heurico 1.11 in 0.00657 seconds.