The generator matrix

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

generates a code of length 42 over Z8 who´s minimum homogenous weight is 30.

Homogenous weight enumerator: w(x)=1x^0+40x^30+94x^31+202x^32+276x^33+387x^34+518x^35+716x^36+1250x^37+1486x^38+2440x^39+3148x^40+3480x^41+4331x^42+3678x^43+3245x^44+2620x^45+1601x^46+1238x^47+679x^48+476x^49+278x^50+202x^51+182x^52+82x^53+56x^54+20x^55+18x^56+8x^57+11x^58+2x^59+1x^60+1x^62+1x^66

The gray image is a code over GF(2) with n=168, k=15 and d=60.
This code was found by Heurico 1.16 in 30.4 seconds.