A013188 E.g.f.: log(cosh(x)+arctan(x))=x-3/3!*x^3+12/4!*x^4-7/5!*x^5-168/6!*x^6...

0, 1, 0, -3, 12, -7, -168, 917, -1568, -7183, 198400, -3803987, 27605248, 316369129, -8352339968, 40892465221, 772060278784, -12655402122271, 84749115129856, -1539257113273507, 2576755050676224

Offset

0,4

Links

Table of n, a(n) for n=0..20.

Mathematica

With[{nn=30}, CoefficientList[Series[Log[Cosh[x]+ArcTan[x]], {x, 0, nn}], x]Range[0, nn]!] (* Harvey P. Dale, Mar 12 2013 *)

Crossrefs

Sequence in context: A355338 A344112 A337203 * A234947 A051353 A070706

Adjacent sequences: A013185 A013186 A013187 * A013189 A013190 A013191

Keyword

sign

Author

Patrick Demichel (patrick.demichel(AT)hp.com)

Extensions

First term prepended and definition clarified by Harvey P. Dale, Mar 12 2013

Status

approved