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A012036
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tan(sin(arcsinh(x)))=x-4/5!*x^5+32/7!*x^7+80/9!*x^9-34048/11!*x^11...
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2
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1, 0, -4, 32, 80, -34048, 5048512, -984048128, 246504417536, -76892124225536, 29350173573487616, -13506119868179701760, 7388967312556159062016, -4745632815309786449379328, 3538391474251613805070172160
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refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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LINKS
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FORMULA
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a(n) ~ (-1)^n * c * (2*n)! / sqrt(n), where c = 0.05565047582054219883411112937... . - Vaclav Kotesovec, Feb 03 2015
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Tan[Sin[ArcSinh[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, May 19 2014 *)
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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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