Expansion of e.g.f. arcsin(sec(x)*arcsinh(x)) (odd powers only).

A012823

Expansion of e.g.f. arcsin(sec(x)*arcsinh(x)) (odd powers only).

Terms

    a(0) =1a(1) =3a(2) =53a(3) =1855a(4) =156425a(5) =19537595a(6) =3987121981

External references