The generator matrix

 1  0  1  1  1  1  1  0  1  1  7  1  1  7  1  1 42  1 21  1 21  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  1  1 31 16  0 31  1  7 38  1  7 38  1 28 45  1 45  1 28  1 48 19  4 19 36 16 48  4 36  9  6 46 26 29  9 26 20 32  8 34 46 12  2 12  1  2  6 18
 0  0 35 21 42  7 28 14 42 14 35 35  0 28 14 35  7 42 21 28 42  0 28 28  0 42 35 14 14 28  0  7  7  7  7 14 42 35  0 21 21 21 21 21 35  0 28 42 35

generates a code of length 49 over Z49 who´s minimum homogenous weight is 286.

Homogenous weight enumerator: w(x)=1x^0+4410x^286+966x^287+3528x^293+450x^294+6468x^300+972x^301+6x^308+6x^322

The gray image is a code over GF(7) with n=343, k=5 and d=286.
This code was found by Heurico 1.16 in 0.265 seconds.