The generator matrix

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

generates a code of length 47 over GR(16,4) who´s minimum homogenous weight is 131.

Homogenous weight enumerator: w(x)=1x^0+1116x^131+495x^132+2232x^135+852x^136+2916x^139+951x^140+2808x^143+945x^144+2028x^147+651x^148+1008x^151+177x^152+180x^155+9x^156+6x^160+6x^164+3x^168

The gray image is a code over GF(4) with n=188, k=7 and d=131.
This code was found by Heurico 1.16 in 15.8 seconds.