10535100

Appears in sequences

• Number of functions f:{1,2,...,n}->{1,2,...,n} whose cycle lengths are <= 2.at n=8A209319
• Number A(n,k) of endofunctions on [n] whose cycle lengths are divisors of k; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=63A246522