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A012456
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exp((arctan(x))^2)=1+2/2!*x^2-4/4!*x^4+8/6!*x^6+912/8!*x^8...
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0
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1, 2, -4, 8, 912, -99168, 11815872, -1790856576, 347783278848, -85244795874816, 25888104843574272, -9570587679263078400, 4239434238319441121280, -2218976274384029204766720
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OFFSET
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0,2
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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[Exp[ArcTan[x]^2], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Apr 24 2016 *)
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CROSSREFS
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Sequence in context: A061089 A067499 A135212 * A071686 A296742 A103097
Adjacent sequences: A012453 A012454 A012455 * A012457 A012458 A012459
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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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EXTENSIONS
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Definition clarified by Harvey P. Dale, Apr 24 2016
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STATUS
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approved
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