E.g.f. arctan(sec(x)*sinh(x)) (odd powers only).

A012816

E.g.f. arctan(sec(x)*sinh(x)) (odd powers only).

Terms

    a(0) =1a(1) =2a(2) =-20a(3) =-488a(4) =22160a(5) =1616672a(6) =-172976960a(7) =-25518205568

External references