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

generates a code of length 50 over GR(16,4) who´s minimum homogenous weight is 141.

Homogenous weight enumerator: w(x)=1x^0+372x^141+369x^144+660x^145+192x^148+780x^149+168x^152+540x^153+186x^156+528x^157+87x^160+192x^161+12x^168+6x^172+3x^176

The gray image is a code over GF(4) with n=200, k=6 and d=141.
This code was found by Heurico 1.16 in 41.8 seconds.