Expansion of e.g.f.: exp(arctan(tanh(x)))=1+x+1/2!*x^2-3/3!*x^3-15/4!*x^4+41/5!*x^5...

A012222

Expansion of e.g.f.: exp(arctan(tanh(x)))=1+x+1/2!*x^2-3/3!*x^3-15/4!*x^4+41/5!*x^5...

Terms

    a(0) =1a(1) =1a(2) =1a(3) =-3a(4) =-15a(5) =41a(6) =561a(7) =-1243a(8) =-40415a(9) =58001a(10) =4825121a(11) =-1956083a(12) =-866056815a(13) =-740509639a(14) =218527875281a(15) =509169335477

External references