Consider the family of directed multigraphs enriched by the species of derangements. Sequence gives number of those multigraphs with n labeled arcs.
A098627
Consider the family of directed multigraphs enriched by the species of derangements. Sequence gives number of those multigraphs with n labeled arcs.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =2a(4) =27a(5) =164a(6) =2335a(7) =25458a(8) =437241a(9) =6965112a(10) =145640817a(11) =3057675290a(12) =76814951587
External references
- oeis: A098627