The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  2  1  1
 0  2  0  0  2  2 2a 2a^2 2a^2+2a 2a^2+2a+2 2a^2+2a+2  2 2a^2+2a+2  0 2a 2a^2+2a  0 2a+2 2a^2+2a 2a 2a 2a 2a^2+2a 2a^2+2a+2 2a^2+2a 2a^2+2a 2a^2+2  2  0  0
 0  0  2  0 2a^2+2 2a^2+2a+2 2a 2a^2+2 2a^2+2 2a 2a^2+2 2a^2 2a 2a^2+2a+2 2a 2a  2  0 2a^2+2a+2  0 2a^2+2a+2 2a^2+2a 2a^2+2  0 2a^2+2a+2 2a  2 2a^2 2a  0
 0  0  0  2  2 2a^2+2a 2a^2+2a  2 2a^2+2 2a^2+2a 2a^2+2 2a^2+2 2a+2  2  2  0 2a^2+2a 2a^2+2 2a 2a^2+2a+2 2a+2  0 2a^2+2a+2  0 2a+2 2a^2 2a^2+2a 2a^2+2a 2a  0

generates a code of length 30 over GR(64,4) who´s minimum homogenous weight is 184.

Homogenous weight enumerator: w(x)=1x^0+224x^184+623x^192+728x^200+3584x^203+644x^208+25088x^211+672x^216+644x^224+504x^232+56x^240

The gray image is a code over GF(8) with n=240, k=5 and d=184.
This code was found by Heurico 1.16 in 0.275 seconds.