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

Symbolics

Substitution:
1->112114
2->11212114
3->113113114
4->113114
Abelianisation:
4 5 6 4
1 2 0 0
0 0 2 1
1 1 1 1

Characteristic polynomial:

(z4 - 9z3 + 18z2 - 9z + 1)

Eigenvalues:

6.4054 0 0 0
0 1.9167 0 0
0 0 0.52172 0
0 0 0 0.15612

Realisations:

Indices:Realisations:
3x2:realisation