Expansion of e.g.f. arctan(arctanh(x)*cos(x)) (odd powers only).

A012742

Expansion of e.g.f. arctan(arctanh(x)*cos(x)) (odd powers only).

Terms

    a(0) =1a(1) =-3a(2) =53a(3) =-1799a(4) =154985a(5) =-16589771a(6) =3172731677a(7) =-721614303695

External references