Expansion of tan(x)/cosh(tan(x)).

A009762

Expansion of tan(x)/cosh(tan(x)).

Terms

    a(0) =1a(1) =-1a(2) =-19a(3) =-253a(4) =-1415a(5) =164999a(6) =15064037a(7) =949320395a(8) =44870780017

External references