The generator matrix

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

generates a code of length 20 over Z8 who´s minimum homogenous weight is 18.

Homogenous weight enumerator: w(x)=1x^0+7x^18+34x^19+47x^20+28x^21+8x^22+2x^23+1x^38

The gray image is a code over GF(2) with n=80, k=7 and d=36.
This code was found by Heurico 1.16 in 0.00149 seconds.