Consider the family of directed multigraphs enriched by the species of derangements. Sequence gives number of those multigraphs with n labeled loops and arcs.
A098626
Consider the family of directed multigraphs enriched by the species of derangements. Sequence gives number of those multigraphs with n labeled loops and arcs.
Terms
- a(0) =1a(1) =0a(2) =2a(3) =4a(4) =57a(5) =348a(6) =5235a(7) =57930a(8) =1037540a(9) =16842496a(10) =363889755a(11) =7792175070a(12) =201054289293
External references
- oeis: A098626