A013133 Expansion of e.g.f.: exp(tanh(x)+tan(x))=1+2*x+4/2!*x^2+8/3!*x^3+16/4!*x^4+64/5!*x^5...

1, 2, 4, 8, 16, 64, 448, 2816, 14592, 80896, 705536, 7278592, 65245184, 532070400, 5385535488, 71008190464, 910402060288, 10323887915008, 124371776831488, 1895043049717760, 30930578556583936

Offset

0,2

Links

Harvey P. Dale, Table of n, a(n) for n = 0..480

Mathematica

With[{nn=20}, CoefficientList[Series[Exp[Tanh[x]+Tan[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Dec 01 2025 *)

Crossrefs

Sequence in context: A074700 A230863 A322037 * A012997 A013184 A066713

Adjacent sequences: A013130 A013131 A013132 * A013134 A013135 A013136

Keyword

nonn

Author

Patrick Demichel

Extensions

Definition clarified by Harvey P. Dale, Dec 01 2025

Status

approved