Expansion of e.g.f.: exp(sech(x)*arctan(x))=1+x+1/2!*x^2-4/3!*x^3-19/4!*x^4+20/5!*x^5...
A012879
Expansion of e.g.f.: exp(sech(x)*arctan(x))=1+x+1/2!*x^2-4/3!*x^3-19/4!*x^4+20/5!*x^5...
Terms
- a(0) =1a(1) =1a(2) =1a(3) =-4a(4) =-19a(5) =20a(6) =565a(7) =1024a(8) =-24743a(9) =-147568a(10) =1450985a(11) =19148736a(12) =-100090043a(13) =-2934842560a(14) =5608180253a(15) =551525234688a(16) =703874231473
External references
- oeis: A012879