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A009498
Expansion of sin(sinh(x)/cos(x)).
0
1, 3, -3, -1113, -77063, -5509845, -430006731, -33282260529, -1454472663311, 448480622503635, 254015086363619949, 101877925964986614135, 39296835590108099513833, 15506451718661316904568571
OFFSET
0,2
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[Sin[Sinh[x]/Cos[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Feb 25 2023 *)
CROSSREFS
Sequence in context: A138662 A009011 A291095 * A076253 A081174 A292832
KEYWORD
sign
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
Previous Mathematica program replaced by Harvey P. Dale, Feb 25 2023
STATUS
approved