Triangular array read by rows. T(n,k) is the number of partial functions on {1,2,...,n} that are endofunctions with no cycles of length > 1 that have exactly k components.
A203092
Triangular array read by rows. T(n,k) is the number of partial functions on {1,2,...,n} that are endofunctions with no cycles of length > 1 that have exactly k components.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =1a(6) =1a(7) =18a(8) =9a(9) =1a(10) =1a(11) =116a(12) =78a(13) =16a(14) =1a(15) =1a(16) =1060a(17) =810a(18) =220a(19) =25a(20) =1a(21) =1a(22) =12702a(23) =10335a(24) =3260a(25) =495a(26) =36a(27) =1a(28) =1a(29) =187810
External references
- oeis: A203092