The generator matrix

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

generates a code of length 71 over GR(16,4) who´s minimum homogenous weight is 206.

Homogenous weight enumerator: w(x)=1x^0+612x^206+480x^207+96x^208+624x^210+516x^211+60x^212+432x^214+204x^215+45x^216+240x^218+120x^219+24x^220+228x^222+120x^223+15x^224+96x^226+36x^227+12x^228+72x^230+60x^231+3x^248

The gray image is a code over GF(4) with n=284, k=6 and d=206.
This code was found by Heurico 1.16 in 85.7 seconds.