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A009760
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Expansion of tan(x)/cosh(ln(1+x)).
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1
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0, 1, 0, -1, 12, -34, 120, 146, -2352, 23848, -53280, -371768, 12223200, -107535440, 706340544, 2599870352, -95898673920, 1486560431744, -8308014488064, -67260673442176, 3505513923832320, -54539552924497664, 499029405102412800
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,5
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..200
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MATHEMATICA
| With[{nn=30}, CoefficientList[Series[Tan[x]/Cosh[Log[1+x]], {x, 0, nn}], x] Range[0, nn]!] (* From Harvey P. Dale, Nov 13 2011 *)
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CROSSREFS
| Sequence in context: A124705 A126366 A199114 * A078194 A034510 A083101
Adjacent sequences: A009757 A009758 A009759 * A009761 A009762 A009763
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KEYWORD
| sign,easy
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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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