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A012808
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arcsinh(sec(x)*arctan(x))=x+28/5!*x^5-728/7!*x^7+54416/9!*x^9...
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0
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1, 0, 28, -728, 54416, -5676352, 900432960, -193766436992, 55349093955840, -20153308820338688, 9138844606925237248, -5050190610067417167872, 3343568694767924711428096, -2613638716122945595362951168
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history;
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internal format)
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OFFSET
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0,3
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LINKS
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[ArcSinh[Sec[x]ArcTan[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Sep 21 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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