Number of block permutations on an n-set.
A023997
Number of block permutations on an n-set.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =25a(4) =339a(5) =6721a(6) =179643a(7) =6166105a(8) =262308819a(9) =13471274401a(10) =818288740923
External references
- oeis: A023997