Expansion of e.g.f. x*cos(tanh(x)), odd powers only.

A009088

Expansion of e.g.f. x*cos(tanh(x)), odd powers only.

Terms

    a(0) =1a(1) =-3a(2) =45a(3) =-1239a(4) =54873a(5) =-3577739a(6) =322495173a(7) =-38370542175

External references