Consider the family of multigraphs enriched by the species of ternary sets. Sequence gives number of those multigraphs with 3n loops and arcs.

A099682

Consider the family of multigraphs enriched by the species of ternary sets. Sequence gives number of those multigraphs with 3n loops and arcs.

Terms

    a(0) =1a(1) =2a(2) =132a(3) =46454a(4) =48860748a(5) =117834107302

External references