Consider the family of directed multigraphs enriched by the species of trees. Sequence gives number of those multigraphs with n labeled loops and edges.
A099718
Consider the family of directed multigraphs enriched by the species of trees. Sequence gives number of those multigraphs with n labeled loops and edges.
Terms
- a(0) =1a(1) =2a(2) =15a(3) =207a(4) =4274a(5) =120698a(6) =4408714a(7) =200482089a(8) =11035845002a(9) =719691942986
External references
- oeis: A099718