Expansion of cos(sin(x))/cos(x), even terms only.

A009043

Expansion of cos(sin(x))/cos(x), even terms only.

Terms

    a(0) =1a(1) =0a(2) =4a(3) =24a(4) =848a(5) =25792a(6) =1491392a(7) =106879616a(8) =10504954112

External references