The generator matrix

 1  0  1  1  1  6  1  1  0  1  1  6  1  1  0  1  1  0
 0  1  3  6  1  1  0  3  1  6  5  1  0  3  1  0  3  1
 0  0  4  0  0  0  0  0  0  0  0  4  0  0  4  4  4  4
 0  0  0  4  0  0  0  0  0  0  0  4  4  4  4  0  0  4
 0  0  0  0  4  0  0  0  0  4  0  0  4  4  4  4  0  0
 0  0  0  0  0  4  0  0  0  4  0  0  0  4  4  0  4  4
 0  0  0  0  0  0  4  0  0  0  4  0  0  4  0  4  4  4
 0  0  0  0  0  0  0  4  0  4  4  4  4  0  0  0  0  4
 0  0  0  0  0  0  0  0  4  4  4  4  4  4  4  4  4  4

generates a code of length 18 over Z8 who´s minimum homogenous weight is 12.

Homogenous weight enumerator: w(x)=1x^0+126x^12+336x^14+2049x^16+3168x^18+2049x^20+336x^22+126x^24+1x^36

The gray image is a code over GF(2) with n=72, k=13 and d=24.
This code was found by Heurico 1.16 in 12.4 seconds.