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A024249 Expansion of tanh(tan(x))*tan(x)/2. 0
0, 1, 4, 24, 192, 9472, 1182208, 135668736, 14993473536, 1702145425408, 212302947942400, 32402586267549696, 6715751146400514048, 1845064263947813650432, 597912413872386432040960 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[Tanh[Tan[x]]*Tan[x]/2, {x, 0, nn}], x] Range[ 0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Jan 30 2023 *)
CROSSREFS
Sequence in context: A002866 A182798 A073840 * A007145 A241000 A305988
KEYWORD
nonn
AUTHOR
EXTENSIONS
Extended and signs tested 03/97.
Previous Mathematica program replaced by Harvey P. Dale, Jan 30 2023
STATUS
approved

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Last modified April 13 15:06 EDT 2024. Contains 371644 sequences. (Running on oeis4.)