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A009186 Expansion of e.g.f.: cosh(x)/exp(tan(x)). 1
1, -1, 2, -6, 16, -72, 328, -1848, 11712, -81088, 638720, -5318016, 49459840, -483162240, 5159926528, -57865303296, 697030680576, -8815813734400, 118233272496128, -1662921003208704, 24578235697610752, -380141599264751616, 6139851821419921408 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
MAPLE
a:= n-> n! * coeff (series (cosh(x)/exp(tan(x)), x, n+1), x, n):
seq (a(n), n=0..30); # Alois P. Heinz, May 16 2012
MATHEMATICA
With[{nn=30}, CoefficientList[Series[Cosh[x]/Exp[Tan[x]], {x, 0, nn}], x] Range[0, nn]!] Harvey P. Dale, May 16 2012
CROSSREFS
Sequence in context: A009386 A009605 A009681 * A009328 A009346 A009367
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
Definition clarified by Harvey P. Dale, May 16 2012
STATUS
approved

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Last modified May 29 14:24 EDT 2024. Contains 372952 sequences. (Running on oeis4.)