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A012451
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tanh(arctan(x)*tan(x))=2/2!*x^2-80/6!*x^6-2688/8!*x^8+18688/10!*x^10...
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0
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2, 0, -80, -2688, 18688, 2928640, 827766784, -52425949184, 11263759220736, -6439993741672448, 1974174235078164480, -952764420869394006016, 577855093673994995367936, -371995357739088472730238976
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OFFSET
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0,1
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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[Tanh[ArcTan[x]Tan[x]], {x, 0, nn}], x] Range[0, nn]!, {3, -1, 2}]] (* Harvey P. Dale, Dec 30 2015 *)
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CROSSREFS
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Sequence in context: A030129 A012647 A012334 * A012447 A136558 A156490
Adjacent sequences: A012448 A012449 A012450 * A012452 A012453 A012454
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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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