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

generates a code of length 64 over GR(16,4) who´s minimum homogenous weight is 184.

Homogenous weight enumerator: w(x)=1x^0+303x^184+168x^185+396x^187+1062x^188+192x^189+180x^191+360x^192+144x^193+294x^196+192x^197+225x^200+72x^201+180x^203+297x^204+12x^207+15x^208+3x^220

The gray image is a code over GF(4) with n=256, k=6 and d=184.
This code was found by Heurico 1.16 in 0.119 seconds.