Expansion of e.g.f. 2/(1 + cos x * cosh x) in powers of x^4.

A008775

Expansion of e.g.f. 2/(1 + cos x * cosh x) in powers of x^4.

Terms

    a(0) =1a(1) =2a(2) =272a(3) =261392a(4) =923578112

External references