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A013173 arctan(arctanh(x)+tan(x))=2*x-12/3!*x^3+488/5!*x^5-48608/7!*x^7... 0
2, -12, 488, -48608, 9080960, -2722798848, 1197871592448, -726520846829568, 581088281306562560, -592572418222512668672, 750419972539476482195456, -1155381150026866713259671552, 2125413346746653166067846742016 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..12.

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[ArcTan[ArcTanh[x]+Tan[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Ray Chandler, Nov 29 2016 *)

CROSSREFS

Sequence in context: A091471 A012625 A012630 * A013147 A250110 A266501

Adjacent sequences:  A013170 A013171 A013172 * A013174 A013175 A013176

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified May 19 08:55 EDT 2022. Contains 353826 sequences. (Running on oeis4.)