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A009509
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Expansion of sin(tan(x))/cos(x).
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0
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1, 4, 32, 264, -9216, -1548032, -190744448, -25395878400, -3862395551744, -674521189158912, -133945803441307648, -29717777068093669376, -7172117320170458939392, -1797012698406108143681536
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Sin[Tan[x]]/Cos[x], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Dec 23 2017 *)
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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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