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A009517 Expansion of sin(tan(x)/cosh(x)). 0
1, -2, 32, -688, 29952, -1922560, 160364544, -19815696384, 2743045259264, -538516252917760, 112957538226929664, -31810392390007521280, 9466977656209217159168, -3592556624975295837896704 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[Sin[Tan[x]/Cosh[x]], {x, 0, nn}], x]Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, May 08 2012 *)
CROSSREFS
Sequence in context: A068110 A304860 A198599 * A354382 A202408 A069182
KEYWORD
sign
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved

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Last modified March 28 13:42 EDT 2024. Contains 371254 sequences. (Running on oeis4.)