Expansion of e.g.f.: arctan(sech(x)*log(x+1))=x-1/2!*x^2-3/3!*x^3+12/4!*x^4+43/5!*x^5...

A012873

Expansion of e.g.f.: arctan(sech(x)*log(x+1))=x-1/2!*x^2-3/3!*x^3+12/4!*x^4+43/5!*x^5...

Terms

    a(0) =0a(1) =1a(2) =-1a(3) =-3a(4) =12a(5) =43a(6) =-555a(7) =-49a(8) =37632a(9) =-154867a(10) =-3817845a(11) =45540649a(12) =409535148a(13) =-12690409929a(14) =-14813266559

External references