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

A099683

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

Terms

    a(0) =1a(1) =1a(2) =61a(3) =19545a(4) =19204813a(5) =43724593641

External references