Expansion of e.g.f. tan(tanh(x))*sin(x) (even powers only).

A009717

Expansion of e.g.f. tan(tanh(x))*sin(x) (even powers only).

Terms

    a(0) =0a(1) =2a(2) =-4a(3) =-42a(4) =1336a(5) =-16726a(6) =-1194700a(7) =153304830a(8) =-10698400400a(9) =188012481362

External references