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A009805 Expansion of sin(tan(x)*sin(x))/2. 0
1, -124, 262096, -2681078464, 83993259325696, -6291889632188161024, 963296773204704677810176, -270352239123704851078462357504, 128399592149905444543967414059073536 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
MATHEMATICA
Tanh[ Sinh[ x ]*Sin[ x ] ]/2 (* [ x^(4n+2) ] *)
With[{nn=34}, Take[CoefficientList[Series[Tanh[Sinh[x]Sin[x]]/2, {x, 0, nn}], x] Range[0, nn]!, {3, -1, 4}]] (* Harvey P. Dale, May 28 2019 *)
CROSSREFS
Cf. A023702.
Sequence in context: A146516 A146546 A146553 * A227393 A005080 A174733
KEYWORD
sign
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved

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Last modified March 3 08:51 EST 2024. Contains 370499 sequences. (Running on oeis4.)