Expansion of E.g.f. cos(sin(sinh(x))), even powers only.

A009038

Expansion of E.g.f. cos(sin(sinh(x))), even powers only.

Terms

    a(0) =1a(1) =-1a(2) =1a(3) =47a(4) =1a(5) =-13409a(6) =77441a(7) =19836879a(8) =-535288319a(9) =-139742075329

External references