Expansion of e.g.f. sec(sin(arctan(x))) = 1/cos(x/sqrt(1+x^2)) (even powers only).
A012028
Expansion of e.g.f. sec(sin(arctan(x))) = 1/cos(x/sqrt(1+x^2)) (even powers only).
Terms
- a(0) =1a(1) =1a(2) =-7a(3) =121a(4) =-3823a(5) =186961a(6) =-12464695a(7) =967217161a(8) =-51115216735
External references
- oeis: A012028