Associated Stirling numbers: second-order reciprocal Stirling numbers (Fekete) a(n) = [[n, 3]]. The number of 3-orbit permutations of an n-set with at least 2 elements in each orbit.
A000483
Associated Stirling numbers: second-order reciprocal Stirling numbers (Fekete) a(n) = [[n, 3]]. The number of 3-orbit permutations of an n-set with at least 2 elements in each orbit.
Terms
- a(0) =15a(1) =210a(2) =2380a(3) =26432a(4) =303660a(5) =3678840a(6) =47324376a(7) =647536032a(8) =9418945536a(9) =145410580224
External references
- oeis: A000483