The generator matrix

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

generates a code of length 55 over GR(16,4) who´s minimum homogenous weight is 148.

Homogenous weight enumerator: w(x)=1x^0+117x^148+144x^149+816x^151+1017x^152+1068x^153+2700x^155+1770x^156+2076x^157+4356x^159+2601x^160+3396x^161+6732x^163+3237x^164+4152x^165+7512x^167+3627x^168+4500x^169+5988x^171+2472x^172+2508x^173+2388x^175+1155x^176+540x^177+228x^179+288x^180+48x^181+39x^184+24x^188+21x^192+12x^196+3x^200

The gray image is a code over GF(4) with n=220, k=8 and d=148.
This code was found by Heurico 1.16 in 15.6 seconds.