Consider the family of directed multigraphs enriched by the species of set partitions. Sequence gives number of those multigraphs with n labeled loops and arcs.
A098622
Consider the family of directed multigraphs enriched by the species of set partitions. Sequence gives number of those multigraphs with n labeled loops and arcs.
Terms
- a(0) =1a(1) =2a(2) =17a(3) =250a(4) =5465a(5) =162677a(6) =6241059a(7) =297132409a(8) =17075153860
External references
- oeis: A098622