Number A(n,k) of endofunctions f on [n] such that f^k(i) = f(i) for all i in [n]; square array A(n,k), n>=0, k>=0, read by antidiagonals.
A245501
Number A(n,k) of endofunctions f on [n] such that f^k(i) = f(i) for all i in [n]; square array A(n,k), n>=0, k>=0, read by antidiagonals.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =4a(9) =1a(10) =1a(11) =1a(12) =3a(13) =27a(14) =1a(15) =1a(16) =1a(17) =4a(18) =10a(19) =256a(20) =1a(21) =1a(22) =1a(23) =3a(24) =19a(25) =41a(26) =3125a(27) =1a(28) =1a(29) =1
External references
- oeis: A245501