Consider the family of multigraphs enriched by the species of derangements. Sequence gives number of those multigraphs with n loops and edges.
A098625
Consider the family of multigraphs enriched by the species of derangements. Sequence gives number of those multigraphs with n loops and edges.
Terms
- a(0) =1a(1) =0a(2) =2a(3) =4a(4) =39a(5) =228a(6) =2400a(7) =23616a(8) =307692a(9) =4197408a(10) =67658769a(11) =1174316570a(12) =22916090131a(13) =482946085932
External references
- oeis: A098625