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

A012627

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

Terms

    a(0) =1a(1) =0a(2) =-12a(3) =360a(4) =-16688a(5) =1189440a(6) =-122878272a(7) =17448342912

External references