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

A009015

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

Terms

    a(0) =1a(1) =-1a(2) =13a(3) =-181a(4) =3865a(5) =-140521a(6) =6324517a(7) =-344747677a(8) =23853473329

External references