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A012044
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sec(sin(arcsinh(x)))=1+1/2!*x^2-3/4!*x^4+21/6!*x^6-647/8!*x^8...
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0
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1, 1, -3, 21, -647, 45161, -4655115, 671831421, -131445679375, 33601481453521, -10874248371483155, 4345212201159011301, -2101132542287329737623, 1209250716473417141359161
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OFFSET
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0,3
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LINKS
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Table of n, a(n) for n=0..13.
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Sec[Sin[ArcSinh[x]]], {x, 0, nn}], x]Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Nov 28 2011 *)
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CROSSREFS
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Sequence in context: A180999 A181003 A093549 * A350513 A098918 A001699
Adjacent sequences: A012041 A012042 A012043 * A012045 A012046 A012047
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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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