The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1
 0  7  0  7 21 21  0  7 21 14 14 14  0  7 21 14 42 42 42 42 21 42  7  0 14  7 28 28 28 28 28  0 21 14 42 28  0  7 21 14 42 28
 0  0  7 35 21 14 28 14  7 35  7 28 35 28  0 14  0  7 14 42 35 28 42 42 21 21 28 21  0 42  7 21 28 42 35 14 14  7 42  0 21 35

generates a code of length 42 over Z49 who´s minimum homogenous weight is 245.

Homogenous weight enumerator: w(x)=1x^0+36x^245+2352x^252+12x^294

The gray image is a code over GF(7) with n=294, k=4 and d=245.
This code was found by Heurico 1.16 in 0.0112 seconds.