Triangular array read by rows, T(n,k) = number of partial functions on {1,2,...,n} with exactly k cycles.
A216520
Triangular array read by rows, T(n,k) = number of partial functions on {1,2,...,n} with exactly k cycles.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =3a(4) =5a(5) =1a(6) =16a(7) =35a(8) =12a(9) =1a(10) =125a(11) =328a(12) =149a(13) =22a(14) =1a(15) =1296a(16) =3894a(17) =2125a(18) =425a(19) =35a(20) =1a(21) =16807a(22) =56221a(23) =35044a(24) =8555a(25) =970a(26) =51a(27) =1a(28) =262144a(29) =958152
External references
- oeis: A216520