Number of directed 2-regular graphs on n nodes.
A219889
Number of directed 2-regular graphs on n nodes.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =23a(4) =92a(5) =624a(6) =5021a(7) =47034a(8) =494320a(9) =5719769a(10) =71971687
External references
- oeis: A219889