Number of endofunctions on [n] where all nonempty preimages have the same cardinality.
A231812
Number of endofunctions on [n] where all nonempty preimages have the same cardinality.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =64a(5) =125a(6) =2826a(7) =5047a(8) =218688a(9) =504009a(10) =32216950a(11) =39916811a(12) =7585223196a(13) =6227020813
External references
- oeis: A231812