Expansion of e.g.f. tan(tanh(x)) (odd powers only).

A003721

Expansion of e.g.f. tan(tanh(x)) (odd powers only).

Terms

    a(0) =1a(1) =0a(2) =-8a(3) =112a(4) =-128a(5) =-109824a(6) =8141824a(7) =-353878016a(8) =-9666461696

External references