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

A012631

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

Terms

    a(0) =1a(1) =0a(2) =12a(3) =-360a(4) =20048a(5) =-1794240a(6) =235532352a(7) =-42633182592

External references