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A009652
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Expansion of tan(ln(1+x)/cos(x)).
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1
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0, 1, -1, 7, -24, 215, -1515, 16721, -176568, 2363165, -32662125, 521810859, -8824531056, 165050184611, -3283420714119, 70591429387077, -1610563051907280, 39183483858949049, -1007242998864835257
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..200
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MATHEMATICA
| With[{nn=20}, CoefficientList[Series[Tan[Log[1+x]/Cos[x]], {x, 0, nn}], x] Range[0, nn]!] (* From Harvey P. Dale, Feb 05 2012 *)
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CROSSREFS
| Sequence in context: A012761 A203117 A197791 * A012777 A074783 A065658
Adjacent sequences: A009649 A009650 A009651 * A009653 A009654 A009655
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KEYWORD
| sign,easy,changed
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net)
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EXTENSIONS
| Extended with signs Mar 15 1997 by Olivier Gerard.
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