Consider the family of directed multigraphs enriched by the species of arborescences. Sequence gives number of those multigraphs with n labeled loops and arcs.
A099714
Consider the family of directed multigraphs enriched by the species of arborescences. Sequence gives number of those multigraphs with n labeled loops and arcs.
Terms
- a(0) =1a(1) =2a(2) =17a(3) =258a(4) =5771a(5) =174528a(6) =6770119a(7) =324895980a(8) =18781627193
External references
- oeis: A099714