The generator matrix

 1  0  1  1  1  0  1  1  0  1  4  1  1  0  1  1  6  4  1  4  1
 0  1  1  0  1  1  0  3  1  4  1  3  0  1  7  6  1  0  5  0  1
 0  0  2  0  0  0  0  0  0  4  4  2  2  2  0  6  6  2  4  4  2
 0  0  0  2  0  0  6  4  6  4  6  2  4  0  6  2  6  0  0  2  6
 0  0  0  0  2  6  6  4  2  2  0  4  2  2  0  4  0  2  6  0  6
 0  0  0  0  0  4  4  4  4  4  0  0  0  0  4  4  4  4  4  4  4

generates a code of length 21 over Z8 who´s minimum homogenous weight is 15.

Homogenous weight enumerator: w(x)=1x^0+66x^15+191x^16+320x^17+648x^18+954x^19+1200x^20+1400x^21+1232x^22+982x^23+639x^24+320x^25+168x^26+46x^27+16x^28+8x^29+1x^40

The gray image is a code over GF(2) with n=84, k=13 and d=30.
This code was found by Heurico 1.16 in 0.583 seconds.