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A012682 sinh(tanh(x)*arctan(x))=2/2!*x^2-16/4!*x^4+440/6!*x^6-25856/8!*x^8... 0
2, -16, 440, -25856, 2460448, -335955200, 62060029824, -14940576792576, 4555904588849664, -1719063029232504832, 787080093043649165312, -430107147338505961406464, 276606088476056370612084736 (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[Sinh[Tanh[x]ArcTan[x]], {x, 0, nn}], x] Range[0, nn]!, {3, -1, 2}]] (* Harvey P. Dale, Jan 01 2020 *)

CROSSREFS

Sequence in context: A229023 A009700 A012030 * A012678 A012146 A113109

Adjacent sequences:  A012679 A012680 A012681 * A012683 A012684 A012685

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified November 27 01:16 EST 2021. Contains 349344 sequences. (Running on oeis4.)