Expansion of e.g.f. Gudermannian(x) = 2*arctan(exp(x)) - Pi/2.

A028296

Expansion of e.g.f. Gudermannian(x) = 2*arctan(exp(x)) - Pi/2.

Terms

    a(0) =1a(1) =-1a(2) =5a(3) =-61a(4) =1385a(5) =-50521a(6) =2702765a(7) =-199360981a(8) =19391512145

External references