334369

Appears in sequences

• Triangle T(n,k) read by rows giving number of labeled mappings (or functional digraphs) from n points to themselves (endofunctions) with exactly k cycles, k=1..n.at n=22A060281
• Number of functions on n labeled nodes whose representation as a digraph has two components.at n=6A065456
• Nonprime numbers n such that phi(n) divides n^2 - 1, where phi(n) (A000010) is Euler's totient function.at n=36A098271