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

generates a code of length 91 over GR(16,4) who´s minimum homogenous weight is 266.

Homogenous weight enumerator: w(x)=1x^0+240x^266+432x^267+90x^268+1728x^269+192x^270+45x^272+156x^274+156x^275+78x^276+18x^280+120x^282+120x^283+15x^284+576x^285+60x^290+60x^291+9x^300

The gray image is a code over GF(4) with n=364, k=6 and d=266.
This code was found by Heurico 1.16 in 20.7 seconds.