The generator matrix

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

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

Homogenous weight enumerator: w(x)=1x^0+22x^18+116x^19+117x^20+92x^21+38x^22+46x^23+34x^24+32x^25+11x^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 1.16 in 0.00352 seconds.