Expansion of tanh(tan(x))*sin(x).

A009811

Expansion of tanh(tan(x))*sin(x).

Terms

    a(0) =0a(1) =2a(2) =-4a(3) =-42a(4) =-456a(5) =10154a(6) =1263668a(7) =74121726a(8) =1582556016a(9) =-396499390126

External references