The generator matrix

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

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

Homogenous weight enumerator: w(x)=1x^0+70x^18+64x^19+28x^20+16x^21+46x^22+16x^23+11x^24+4x^26

The gray image is a code over GF(2) with n=80, k=8 and d=36.
This code was found by Heurico 1.16 in 0.00418 seconds.