The generator matrix

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

generates a code of length 18 over Z49 who´s minimum homogenous weight is 84.

Homogenous weight enumerator: w(x)=1x^0+630x^84+1446x^91+2100x^98+3708x^105+100842x^108+4692x^112+3282x^119+948x^126

The gray image is a code over GF(7) with n=126, k=6 and d=84.
This code was found by Heurico 1.16 in 2.73 seconds.