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

generates a code of length 69 over GR(16,4) who´s minimum homogenous weight is 206.

Homogenous weight enumerator: w(x)=1x^0+180x^206+45x^208+18x^216+12x^222

The gray image is a code over GF(4) with n=276, k=4 and d=206.
This code was found by Heurico 1.16 in 0.313 seconds.