The generator matrix

 1  0  1  1  1 3X+2  1  1  1 2X  1 X+2  1  1  1  1  X  1
 0  1 X+1 X+2  3  1 3X+2 X+3 2X+1  1 2X  1 X+1 X+1 2X+3 2X+3 2X  2
 0  0  2  0 2X 2X+2 2X+2 2X+2 2X  2  2  0  0 2X  2  2  2  2
 0  0  0 2X 2X 2X  0 2X  0  0 2X 2X  0 2X  0 2X  0  0

generates a code of length 18 over Z4[X]/(X^2+2) who´s minimum homogenous weight is 15.

Homogenous weight enumerator: w(x)=1x^0+84x^15+208x^16+498x^17+489x^18+488x^19+186x^20+76x^21+6x^22+4x^23+5x^24+2x^25+1x^26

The gray image is a code over GF(2) with n=144, k=11 and d=60.
This code was found by Heurico 1.16 in 0.015 seconds.