The generator matrix

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

generates a code of length 46 over GR(16,4) who´s minimum homogenous weight is 131.

Homogenous weight enumerator: w(x)=1x^0+480x^131+177x^132+240x^133+168x^134+720x^135+195x^136+264x^137+108x^138+504x^139+108x^140+168x^141+60x^142+192x^143+57x^144+24x^145+36x^146+312x^147+99x^148+72x^149+12x^150+96x^151+3x^152

The gray image is a code over GF(4) with n=184, k=6 and d=131.
This code was found by Heurico 1.16 in 0.125 seconds.