Expansion of e.g.f. cos(x/cos(x)) (even powers only).

A009118

Expansion of e.g.f. cos(x/cos(x)) (even powers only).

Terms

    a(0) =1a(1) =-1a(2) =-11a(3) =-181a(4) =-3863a(5) =-66121a(6) =4478365a(7) =1211701763a(8) =226423491793

External references