The generator matrix

 1  0  1  1  1  1  1  1  1  0  1  1  1  1  0  1  1  1  1  2  1  1  1  1  2  1  1  2  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 2a+2  2 2a+2 2a+2  0 2a+2  2 2a
 0  1  1  a a+1  0 2a+3  a a+1  1  0  a 2a+3 a+1  1  2 2a+3 a+2 a+3  1  2  1 a+2 a+3  1  2 2a+1  1  0 3a+2 a+3 2a+3 a+2  2 2a  3 a+2 2a+1 a+1  1 3a+2 2a+1  1 2a+1 3a+2  1 3a+1  a 3a+2 a+1 3a+1 3a+1 3a+3  a 3a+1 a+2 a+3 2a+1 3a a+3 2a+3 3a+2 3a+1  2 2a  0  1  1  1  1  1  1  1  1  1
 0  0 2a+2  0  2  0  2 2a 2a 2a 2a  2 2a+2 2a+2  0 2a+2  0 2a+2  0  2  2 2a 2a  2 2a+2 2a  2 2a 2a+2  2  0  2  2 2a+2  0 2a+2 2a 2a+2  2 2a  0 2a  0  2 2a+2  0  0  0 2a+2 2a 2a+2 2a 2a+2 2a 2a 2a+2  2 2a  2 2a+2  0  0  0 2a  2  2  2 2a+2 2a 2a+2  2 2a  0 2a+2  2
 0  0  0  2 2a 2a  0 2a  2  2  0  2 2a  2  2  0  0  2  2  2  0  0  2  2  2 2a 2a  0 2a 2a 2a  2 2a+2 2a+2 2a+2  2 2a+2 2a+2  0 2a+2 2a+2  2  2 2a+2 2a+2 2a+2  0 2a 2a  0  0 2a 2a  0 2a+2  0 2a+2 2a  0 2a+2 2a  0 2a+2 2a+2 2a+2 2a 2a 2a 2a+2  0 2a+2 2a 2a+2 2a+2  0

generates a code of length 75 over GR(16,4) who´s minimum homogenous weight is 217.

Homogenous weight enumerator: w(x)=1x^0+144x^217+423x^220+1920x^221+333x^224+144x^225+48x^228+144x^229+96x^233+198x^236+624x^237+18x^240+3x^252

The gray image is a code over GF(4) with n=300, k=6 and d=217.
This code was found by Heurico 1.16 in 0.397 seconds.