E.g.f. tanh(sin(x)*sin(x)) (even powers only).

A009801

E.g.f. tanh(sin(x)*sin(x)) (even powers only).

Terms

    a(0) =0a(1) =2a(2) =-8a(3) =-208a(4) =13312a(5) =-80128a(6) =-84819968a(7) =9993992192a(8) =759755210752

External references