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A009765
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Expansion of tan(x/cos(x)).
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0
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1, 5, 101, 4689, 381769, 47849053, 8532452397, 2051184222377, 639121206054545, 250473754883360181, 120568689462321176053, 69926680208791530760705, 48091629862193464534126041
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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MATHEMATICA
| With[{nn=30}, Take[CoefficientList[Series[Tan[x/Cos[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* From Harvey P. Dale, Jan 06 2012 *)
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CROSSREFS
| Sequence in context: A074790 A009757 A119556 * A113073 A057207 A124986
Adjacent sequences: A009762 A009763 A009764 * A009766 A009767 A009768
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KEYWORD
| nonn
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net)
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EXTENSIONS
| Extended and signs tested Mar 15 1997 by Olivier Gerard.
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