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
 0  2  0  0  0  2  2  2 2a  0  2 2a 2a 2a 2a  2 2a 2a^2+2a+2  0 2a^2+2a+2 2a  0 2a^2+2a 2a^2+2 2a^2+2a+2 2a^2+2 2a^2+2a 2a^2 2a^2 2a  2 2a 2a^2+2a 2a^2 2a^2  0  0
 0  0  2  0  0 2a^2+2 2a^2+2a+2 2a^2+2a 2a^2+2a  2 2a+2 2a^2+2  0  2 2a^2+2a+2 2a^2 2a 2a^2+2 2a^2 2a+2  2  2 2a^2+2a  2 2a+2 2a^2+2 2a+2  0 2a^2+2a  2 2a^2+2a 2a 2a^2 2a+2 2a^2 2a^2+2a  0
 0  0  0  2  0  2 2a^2+2a+2 2a 2a+2 2a^2 2a^2+2  0 2a^2+2a+2  2 2a 2a^2+2a 2a^2+2a 2a^2+2a  2 2a^2+2a+2 2a^2+2a+2  2 2a^2+2  2 2a^2+2a 2a^2+2a 2a^2 2a^2+2a 2a^2 2a^2+2a  0 2a^2 2a+2 2a+2 2a^2+2 2a  0
 0  0  0  0  2 2a^2+2 2a+2 2a 2a^2+2a+2 2a 2a^2 2a^2 2a+2  0 2a  0 2a^2 2a^2+2a 2a^2+2a 2a+2 2a^2+2a  0 2a^2 2a+2  2 2a^2+2  0 2a^2+2a+2 2a^2+2a 2a 2a^2+2 2a^2 2a^2+2a  2 2a^2 2a^2  0

generates a code of length 37 over GR(64,4) who´s minimum homogenous weight is 216.

Homogenous weight enumerator: w(x)=1x^0+112x^216+1134x^224+2233x^232+3066x^240+4102x^248+5194x^256+229376x^259+6055x^264+5936x^272+3528x^280+1197x^288+210x^296

The gray image is a code over GF(8) with n=296, k=6 and d=216.
This code was found by Heurico 1.16 in 20.7 seconds.