Consider the family of multigraphs enriched by the species of ternary sets. Sequence gives number of those multigraphs with 3n loops and edges.
A099681
Consider the family of multigraphs enriched by the species of ternary sets. Sequence gives number of those multigraphs with 3n loops and edges.
Terms
- a(0) =1a(1) =2a(2) =72a(3) =12630a(4) =6608296a(5) =7926336602
External references
- oeis: A099681