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A012175
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sin(tan(arctanh(x)))=x+3/3!*x^3+41/5!*x^5+1019/7!*x^7+12305/9!*x^9...
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0
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1, 3, 41, 1019, 12305, -7478221, -3005647943, -1143787246421, -494108406644959, -250135591701350045, -148735005859748997559, -103273288933359010564517, -83050756624193183081902799
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history;
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internal format)
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Sin[Tan[ArcTanh[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Feb 07 2015 *)
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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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