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A009159 Expansion of cosh(tan(x))*cos(x). 0
1, 0, 4, 56, 1744, 86208, 6199744, 608357504, 77889982720, 12588540708864, 2503565961032704, 600347512023062528, 170721835772956659712, 56780394898390577528832, 21828678118361789793746944 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[Cosh[Tan[x]]*Cos[x], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Jul 28 2019 *)
CROSSREFS
Sequence in context: A009563 A261747 A111849 * A013055 A243486 A322733
KEYWORD
nonn
AUTHOR
EXTENSIONS
Extended and signs tested Mar 15 1997 by Olivier Gérard.
Previous Mathematica program replaced by Harvey P. Dale, Jul 28 2019
STATUS
approved

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Last modified July 13 04:46 EDT 2024. Contains 374267 sequences. (Running on oeis4.)