Number of permutations p of [n] without fixed points such that p^n = Id.
A261431
Number of permutations p of [n] without fixed points such that p^n = Id.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =2a(4) =9a(5) =24a(6) =175a(7) =720a(8) =7665a(9) =42560a(10) =436401a(11) =3628800a(12) =70215145a(13) =479001600a(14) =7116730335a(15) =88966701824
External references
- oeis: A261431