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A009708
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Expansion of tan(tan(x)/cos(x)).
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0
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1, 7, 177, 10519, 1108833, 180134183, 41643888145, 12982974409271, 5247381641852609, 2667871676330509895, 1666128949779524612977, 1253728661849677130856279, 1118729647152655182634160673
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OFFSET
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0,2
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LINKS
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Table of n, a(n) for n=0..12.
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Tan[Tan[x]/Cos[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Oct 13 2014 *)
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CROSSREFS
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Sequence in context: A152930 A027489 A098433 * A231490 A231489 A221110
Adjacent sequences: A009705 A009706 A009707 * A009709 A009710 A009711
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin
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EXTENSIONS
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Extended and signs tested Mar 15 1997 by Olivier Gérard.
Prior Mathematica program replaced by Harvey P. Dale, Oct 13 2014
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STATUS
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approved
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