The generator matrix

 1  0  0  0  1  1  1  2 10  1 12  1  1  1 14 12 14  0  1  6  1  1  0  1 12  1  1  1  1 14 12  1  1 14 12  1 10  1  2 12  8  1  2  1 12  1  1 14  0  1  1  1  6  1 14 10  1  4  1  2 10  1  1
 0  1  0  0  0  9  5  1  1  8  1  4  7 11  0  1 10 10  2  1 10  5  1  7  1  4  1 12 13  1  1  9 11  6  4 11  1  4  0 10  6 12  4  3  1 14  4  0  1 14  2 15  1  0  1  1 11  1 14  1  0 12  0
 0  0  1  0  1  1  4  5  2 10  3  3 12  5  1  5  1 14  3 10 14  7  8  8 13  4 10  3 15  9 14 13  6  1  1  4 15  0  1  1  8  7  1  5  2 14  9  2  5 12  5  6  4  2 13  4 12 13  1  6  1 15  0
 0  0  0  1  1  4  1  1 15  9  6 10 14 11  9  5  3  1  1 10  7 11 11 11  2  2  6 12  6 15 11 13 11  8  9 12  8  5 14 10  1 15 15  1  4  0  0  1 12  9 12  5  0  0  4 10 15 12 12  9 13  7  0
 0  0  0  0 12  0  0  0  0  0  0  0  0  0  0  0  0  0  8  8  8  8  8  8 12 12  4 12  4 12 12  4  4  4 12  4  4  4  4  8  4  8  4  8 12 12  4  4  4 12 12  8  8  8  4  8 12  8  8 12  4  0  0

generates a code of length 63 over Z16 who´s minimum homogenous weight is 54.

Homogenous weight enumerator: w(x)=1x^0+71x^54+642x^55+1992x^56+4434x^57+8341x^58+13424x^59+19932x^60+29660x^61+33148x^62+37988x^63+34460x^64+29222x^65+20426x^66+14124x^67+7386x^68+3824x^69+1866x^70+740x^71+313x^72+62x^73+49x^74+8x^75+12x^76+12x^77+1x^78+2x^79+2x^81+2x^82

The gray image is a code over GF(2) with n=504, k=18 and d=216.
This code was found by Heurico 1.16 in 580 seconds.