K = {*12341-12-13-14-1}

Symbolics

Substitution:
1->114
2->121313131214
3->12131313131214
4->1214
Abelianisation:
2 6 7 2
0 2 2 1
0 3 4 0
1 1 1 1

Characteristic polynomial:

(z4 - 9z3 + 19z2 - 9z + 1)

Eigenvalues:

6.1399 0 0 0
0 2.2535 0 0
0 0 0.44376 0
0 0 0 0.16287

Realisations:

Indices:Realisations:
3x2:realisation