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A024231 Expansion of tanh(tan(x))*sin(x)/2. 0
0, 1, -2, -21, -228, 5077, 631834, 37060863, 791278008, -198249695063, -43572627802442, -5264284574193645, -189769141997109804, 100566175129622055037, 26413749605638836403666 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[Tanh[Tan[x]]*Sin[x]/2, {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Aug 26 2020 *)
CROSSREFS
Cf. A009811.
Sequence in context: A099748 A023812 A062813 * A069717 A036679 A134490
KEYWORD
sign
AUTHOR
EXTENSIONS
Extended with signs Mar 1997
Previous Mathematica program replaced by Harvey P. Dale, Aug 26 2020
STATUS
approved

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Last modified July 22 09:18 EDT 2024. Contains 374485 sequences. (Running on oeis4.)