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A012802
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sin(sec(x)*arctan(x))=x+20/5!*x^5-784/7!*x^7+26256/9!*x^9...
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0
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1, 0, 20, -784, 26256, -4466176, 435729216, -104111460608, 23261262303488, -7794968497086464, 2988775301503636480, -1434421552426973564928, 811112609409475303936000, -540598484103424258178285568
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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[Sin[Sec[x]ArcTan[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, May 24 2013 *)
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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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