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A009517
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Expansion of sin(tan(x)/cosh(x)).
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0
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1, -2, 32, -688, 29952, -1922560, 160364544, -19815696384, 2743045259264, -538516252917760, 112957538226929664, -31810392390007521280, 9466977656209217159168, -3592556624975295837896704
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Sin[Tan[x]/Cosh[x]], {x, 0, nn}], x]Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, May 08 2012 *)
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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