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A012170
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arcsin(tan(tanh(x)))=x+1/3!*x^3+1/5!*x^5+169/7!*x^7+5857/9!*x^9...
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0
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1, 1, 1, 169, 5857, 365905, 48069217, 6592812217, 1367546003521, 352618786733473, 113088877092468289, 44682599178075094729, 21050259388599343979041, 11746444483256346415750897
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internal format)
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OFFSET
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0,4
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LINKS
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[ArcSin[Tan[Tanh[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -2, 2}]] (* Harvey P. Dale, Sep 24 2016 *)
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CROSSREFS
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KEYWORD
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nonn
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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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