Expansion of cosh(tan(x))*cos(x).

A009159

Expansion of cosh(tan(x))*cos(x).

Terms

    a(0) =1a(1) =0a(2) =4a(3) =56a(4) =1744a(5) =86208a(6) =6199744a(7) =608357504a(8) =77889982720

External references