Expansion of tanh(x)/cos(tan(x)) (odd powers only).

A009841

Expansion of tanh(x)/cos(tan(x)) (odd powers only).

Terms

    a(0) =1a(1) =1a(2) =61a(3) =1933a(4) =158041a(5) =16465241a(6) =2606419349a(7) =539107003685

External references