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A012730
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tan(arctanh(x)*arctan(x))=2/2!*x^2+448/6!*x^6+2138112/10!*x^10...
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0
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2, 448, 2138112, 53551718400, 4262315839979520, 826978943730607718400, 331594807758028302723317760, 245412719115132295441404238233600, 308745457206861968420290988707864903680, 620129923454446057412994114512456319793889280
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OFFSET
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0,1
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LINKS
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MATHEMATICA
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With[{nn=40}, Take[CoefficientList[Series[Tan[ArcTanh[x]ArcTan[x]], {x, 0, nn}], x] Range[0, nn-2]!, {3, -1, 4}]] (* Harvey P. Dale, Sep 24 2013 *)
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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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EXTENSIONS
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Definition clarified by and more terms from Harvey P. Dale, Sep 24 2013
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STATUS
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approved
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