Expansion of e.g.f. cos(sin(arctan(x))) (even powers).

A012023

Expansion of e.g.f. cos(sin(arctan(x))) (even powers).

Terms

    a(0) =1a(1) =-1a(2) =13a(3) =-421a(4) =25369a(5) =-2449801a(6) =346065061a(7) =-67243537453

External references