Number of endofunctions on [n] such that no element has a preimage of cardinality one.
A231797
Number of endofunctions on [n] such that no element has a preimage of cardinality one.
Terms
- a(0) =1a(1) =0a(2) =2a(3) =3a(4) =40a(5) =205a(6) =2556a(7) =24409a(8) =347712a(9) =4794633a(10) =81163900a(11) =1434596581a(12) =28725779952a(13) =612610306477
External references
- oeis: A231797