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

generates a code of length 69 over GR(16,4) who´s minimum homogenous weight is 200.

Homogenous weight enumerator: w(x)=1x^0+621x^200+792x^202+792x^204+360x^206+426x^208+240x^212+255x^216+360x^218+216x^220+24x^222+6x^224+3x^240

The gray image is a code over GF(4) with n=276, k=6 and d=200.
This code was found by Heurico 1.16 in 52.7 seconds.