Consider the family of multigraphs enriched by the species of derangements. Sequence gives number of those multigraphs with n labeled edges.
A098624
Consider the family of multigraphs enriched by the species of derangements. Sequence gives number of those multigraphs with n labeled edges.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =2a(4) =15a(5) =84a(6) =750a(7) =6852a(8) =79639a(9) =1006184a(10) =14875218a(11) =241078100a(12) =4392257716a(13) =87279581232
External references
- oeis: A098624