Expansion of tan(tan(x))/cosh(x) (odd powers only).

A009702

Expansion of tan(tan(x))/cosh(x) (odd powers only).

Terms

    a(0) =1a(1) =1a(2) =57a(3) =1657a(4) =136977a(5) =14004945a(6) =2219125001a(7) =457176874377

External references