The generator matrix

 1  1  1  1  1  1  X
 0 2X  0  0  0  0 2X
 0  0 2X  0  0  0 2X
 0  0  0 2X  0  0 2X
 0  0  0  0 2X  0 2X
 0  0  0  0  0 2X 2X

generates a code of length 7 over Z4[X]/(X^2+2) who´s minimum homogenous weight is 4.

Homogenous weight enumerator: w(x)=1x^0+21x^4+32x^6+384x^7+67x^8+7x^12

The gray image is a code over GF(2) with n=56, k=9 and d=16.
This code was found by Heurico 1.16 in -1.01e-007 seconds.