The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  3  1  1  1  1
 0  3  0  0  0  0  0  0  0  0  3  3  3  3  3  6  6  0
 0  0  3  0  0  0  0  0  3  3  6  6  6  3  3  0  0  3
 0  0  0  3  0  0  0  3  6  6  6  6  0  0  3  0  3  3
 0  0  0  0  3  0  0  6  6  3  6  0  3  0  3  3  3  6
 0  0  0  0  0  3  0  6  3  6  0  6  3  0  0  3  6  6
 0  0  0  0  0  0  3  3  0  3  3  6  3  6  0  3  6  0

generates a code of length 18 over Z9 who´s minimum homogenous weight is 24.

Homogenous weight enumerator: w(x)=1x^0+108x^24+162x^27+226x^30+358x^33+1458x^34+382x^36+2916x^37+466x^39+274x^42+130x^45+64x^48+16x^51

The gray image is a code over GF(3) with n=54, k=8 and d=24.
This code was found by Heurico 1.16 in 0.191 seconds.