Number of endofunctions on [2n] whose cycle lengths are multiples of n.

A246618

Number of endofunctions on [2n] whose cycle lengths are multiples of n.

Terms

    a(0) =1a(1) =4a(2) =57a(3) =4480a(4) =866460a(5) =302835456a(6) =165589522560

External references