The generator matrix

 1  1  1  1  1  1  1  1
 0  7  0  7 21 42 42 28
 0  0  7 35 21  7 21 35

generates a code of length 8 over Z49 who´s minimum homogenous weight is 42.

Homogenous weight enumerator: w(x)=1x^0+168x^42+2058x^48+48x^49+126x^56

The gray image is a code over GF(7) with n=56, k=4 and d=42.
This code was found by Heurico 1.16 in 0.000414 seconds.