The number of functions f:{1,2,...,n}->{1,2,...,n} such that the number of elements that are mapped to m is divisible by m.
A178682
The number of functions f:{1,2,...,n}->{1,2,...,n} such that the number of elements that are mapped to m is divisible by m.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =13a(5) =42a(6) =150a(7) =576a(8) =2266a(9) =9966a(10) =47466a(11) =237019a(12) =1224703a(13) =6429152a(14) =35842344a(15) =212946552a(16) =1325810173a(17) =8488092454a(18) =55276544436a(19) =362961569008
External references
- oeis: A178682