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A009161 Expansion of cosh(tan(x))/exp(x). 1
1, -1, 2, -4, 16, -56, 328, -1576, 11712, -70912, 638720, -4668544, 49459840, -423673472, 5159926528, -50674728448, 697030680576, -7717401038848, 118233272496128, -1456461190426624, 24578235697610752, -333308651379949568 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
MATHEMATICA
With[{nn=30}, CoefficientList[Series[Cosh[Tan[x]]/Exp[x], {x, 0, nn}], x] Range[ 0, nn]!] (* Harvey P. Dale, Apr 08 2014 *)
CROSSREFS
Sequence in context: A153957 A068789 A009624 * A009290 A235459 A081919
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
Mathematica program replaced by Harvey P. Dale, Apr 08 2014
STATUS
approved

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Last modified June 17 21:09 EDT 2024. Contains 373464 sequences. (Running on oeis4.)