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A013297 -arctan(log(x+1)-arctanh(x))=1/2!*x^2+6/4!*x^4+90/6!*x^6+2520/8!*x^8... 0
0, 1, 6, 90, 2520, 120960, 9979200, 1377295920, 285145660800, 78922558915200, 27250976424672000, 11359413770434329600, 5628391828843104921600, 3284252230408078849920000, 2238997166752030045320960000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..14.

MATHEMATICA

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

CROSSREFS

Sequence in context: A177289 A177290 A000680 * A232979 A218758 A219304

Adjacent sequences:  A013294 A013295 A013296 * A013298 A013299 A013300

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified October 18 05:17 EDT 2018. Contains 316304 sequences. (Running on oeis4.)