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A012431
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sech(arctan(x)*sin(x)) = 1-12/4!*x^4+360/6!*x^6-7280/8!*x^8...
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0
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1, 0, -12, 360, -7280, -383040, 89394624, -8970625664, -316692862720, 470941672802304, -146844936720038912, 18279034160407939072, 9932590980055055503360, -8395139128320596309032960
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OFFSET
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0,3
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LINKS
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Sech[ArcTan[x]Sin[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Aug 28 2017 *)
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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Patrick Demichel (patrick.demichel(AT)hp.com)
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STATUS
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approved
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