The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  2  1  0  1  2  4  1  4
 0  2  0  2  0  4  2  6  0  4  2  6  0  2  2  2  0  6  2  2  4
 0  0  2  2  0  2  6  4  0  2  2  0  4  6  2  4  2  0  6  0  4
 0  0  0  4  0  0  4  0  4  4  0  4  4  0  0  4  4  0  0  4  4
 0  0  0  0  4  4  4  4  4  4  0  4  0  4  4  4  4  4  4  4  4

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

Homogenous weight enumerator: w(x)=1x^0+113x^18+160x^20+147x^22+58x^24+23x^26+4x^28+5x^30+1x^32

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 10.6 seconds.