The generator matrix

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

generates a code of length 26 over Z8 who´s minimum homogenous weight is 20.

Homogenous weight enumerator: w(x)=1x^0+232x^20+608x^22+1932x^24+2640x^26+1976x^28+576x^30+195x^32+16x^34+16x^36

The gray image is a code over GF(2) with n=104, k=13 and d=40.
This code was found by Heurico 1.16 in 36.9 seconds.