Expansion of e.g.f.: exp(tan(arctanh(x)))=1+x+1/2!*x^2+5/3!*x^3+17/4!*x^4+121/5!*x^5...

A012174

Expansion of e.g.f.: exp(tan(arctanh(x)))=1+x+1/2!*x^2+5/3!*x^3+17/4!*x^4+121/5!*x^5...

Terms

    a(0) =1a(1) =1a(2) =1a(3) =5a(4) =17a(5) =121a(6) =721a(7) =6621a(8) =56545a(9) =636337a(10) =7062241a(11) =94260341a(12) =1283497841a(13) =19853570985a(14) =319471153457

External references