The generator matrix

 1  0  0  1  1  1  1  1 35  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  1  0 36 31 16 35 17  1 48  1  9 34 18 19 28 29 44 25 38 46 26  4 13  5 45 14 29 30 20 22 12  2 25 36 46 44 24 33 16 10  8 48 33 27
 0  0  1  5 31 34 36  4 16 38  2 21 46 37 40 30 48 10 39 33 27 35 29 41 44 13 12 17  1 15 39  8 12 25  9 19 20  4 42  0 28 29 32 20 23

generates a code of length 45 over Z49 who´s minimum homogenous weight is 256.

Homogenous weight enumerator: w(x)=1x^0+3108x^256+2898x^257+42x^258+576x^259+756x^260+2520x^261+1764x^262+13860x^263+6174x^264+504x^265+2682x^266+2016x^267+3780x^268+1764x^269+18522x^270+9534x^271+1512x^272+5226x^273+3402x^274+6048x^275+2646x^276+20076x^277+8148x^278+36x^280+18x^287+24x^294+6x^301+6x^308

The gray image is a code over GF(7) with n=315, k=6 and d=256.
This code was found by Heurico 1.16 in 3.18 seconds.