Expansion of e.g.f.: log(sech(x)+arcsinh(x))=x-2/2!*x^2+4/3!*x^3-12/4!*x^4+68/5!*x^5...

A013207

Expansion of e.g.f.: log(sech(x)+arcsinh(x))=x-2/2!*x^2+4/3!*x^3-12/4!*x^4+68/5!*x^5...

Terms

    a(0) =0a(1) =1a(2) =-2a(3) =4a(4) =-12a(5) =68a(6) =-440a(7) =3064a(8) =-26208a(9) =265936a(10) =-2945152a(11) =35730176a(12) =-485182720a(13) =7235106240a(14) =-115677206528

External references