The generator matrix

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

generates a code of length 71 over GR(16,4) who´s minimum homogenous weight is 197.

Homogenous weight enumerator: w(x)=1x^0+540x^197+408x^198+468x^199+909x^200+1632x^201+1548x^202+1296x^203+1719x^204+3540x^205+2112x^206+2148x^207+1941x^208+4260x^209+2808x^210+2172x^211+2568x^212+4596x^213+2808x^214+2268x^215+2769x^216+4332x^217+2964x^218+2208x^219+2025x^220+3540x^221+1752x^222+1332x^223+942x^224+1620x^225+840x^226+372x^227+357x^228+456x^229+120x^230+24x^231+78x^232+60x^233+3x^244

The gray image is a code over GF(4) with n=284, k=8 and d=197.
This code was found by Heurico 1.16 in 20.3 seconds.