E.g.f. tanh(sin(sin(x))) (odd powers only).

A009791

E.g.f. tanh(sin(sin(x))) (odd powers only).

Terms

    a(0) =1a(1) =-4a(2) =68a(3) =-2584a(4) =171344a(5) =-17464448a(6) =2529148352a(7) =-493428887168

External references