Expansion of e.g.f.: exp(arctan(x)+tan(x))=1+2*x+4/2!*x^2+8/3!*x^3+16/4!*x^4+72/5!*x^5...
A012997
Expansion of e.g.f.: exp(arctan(x)+tan(x))=1+2*x+4/2!*x^2+8/3!*x^3+16/4!*x^4+72/5!*x^5...
Terms
- a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =72a(6) =544a(7) =3040a(8) =11008a(9) =64896a(10) =1060224a(11) =10595840a(12) =38065152a(13) =87854080a(14) =9708670976a(15) =170663275520a(16) =276991311872
External references
- oeis: A012997