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
 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
 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 35

generates a code of length 40 over Z49 who´s minimum homogenous weight is 231.

Homogenous weight enumerator: w(x)=1x^0+54x^231+174x^238+2058x^240+96x^245+6x^259+12x^280

The gray image is a code over GF(7) with n=280, k=4 and d=231.
This code was found by Heurico 1.16 in 0.01 seconds.