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A009807 Expansion of tanh(tan(sin(x))). 0
1, -1, -7, 167, 1553, -238481, 4553, 1254638551, -35872740703, -17157807788193, 1532562286297113, 488815558185860999, -101586398550375052879, -24471009470566855107377, 10960094402513781594777321 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[Tanh[Tan[Sin[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Oct 24 2016 *)
CROSSREFS
Sequence in context: A012689 A098632 A192275 * A220991 A165388 A124126
KEYWORD
sign
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
Prior Mathematica program replaced by Harvey P. Dale, Oct 24 2016
STATUS
approved

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Last modified February 23 03:03 EST 2024. Contains 370266 sequences. (Running on oeis4.)