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

generates a code of length 84 over GR(16,4) who´s minimum homogenous weight is 245.

Homogenous weight enumerator: w(x)=1x^0+372x^245+768x^246+132x^248+516x^249+624x^250+69x^252+312x^253+504x^254+3x^256+72x^257+120x^258+24x^260+108x^261+108x^262+9x^264+60x^265+72x^266+72x^269+84x^270+12x^272+24x^273+24x^274+3x^280+3x^300

The gray image is a code over GF(4) with n=336, k=6 and d=245.
This code was found by Heurico 1.16 in 61.4 seconds.