Expansion of e.g.f.: 1/cos(sin(x)) (even-indexed coefficients only).

A009008

Expansion of e.g.f.: 1/cos(sin(x)) (even-indexed coefficients only).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =-23a(4) =-415a(5) =849a(6) =421089a(7) =16027897a(8) =-602344127a(9) =-137830187103

External references