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A009260
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Expansion of exp(tanh(tan(x))).
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0
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1, 1, 1, 1, 1, -7, -47, -279, -1343, -5167, -8671, 150833, 2436545, 27945609, 249528945, 1993449433, 10176663169, -9028140255, -1606374108095, -31838140005407, -482969577637247, -6048738288194407, -59264468409177327
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,6
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LINKS
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Table of n, a(n) for n=0..22.
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MATHEMATICA
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With[{nn=30}, CoefficientList[Series[Exp[Tanh[Tan[x]]], {x, 0, nn}], x] Range[ 0, nn]!] (* Harvey P. Dale, Jun 08 2021 *)
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CROSSREFS
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Sequence in context: A091516 A064385 A269520 * A201871 A198845 A323131
Adjacent sequences: A009257 A009258 A009259 * A009261 A009262 A009263
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KEYWORD
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sign,easy
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AUTHOR
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R. H. Hardin
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EXTENSIONS
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Extended with signs by Olivier Gérard, Mar 15 1997
Previous Mathematica program replaced by Harvey P. Dale, Jun 08 2021
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STATUS
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approved
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