Expansion of e.g.f.: sec(exp(x)-sec(x))=1+1/2!*x^2+9/4!*x^4-20/5!*x^5+177/6!*x^6...

A013338

Expansion of e.g.f.: sec(exp(x)-sec(x))=1+1/2!*x^2+9/4!*x^4-20/5!*x^5+177/6!*x^6...

Terms

    a(0) =1a(1) =0a(2) =1a(3) =0a(4) =9a(5) =-20a(6) =177a(7) =-1260a(8) =7105a(9) =-99144a(10) =564049a(11) =-10278840a(12) =77134761a(13) =-1412196188a(14) =15082747617a(15) =-257693157540

External references