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A009032 Expansion of cos(log(1+x)/cos(x)). 1
1, 0, -1, 3, -22, 100, -700, 3990, -28628, 171288, -1025420, 1661660, 78215392, -2266954560, 46180065256, -873515610240, 16163533621648, -300558671466048, 5688054655288496, -109993409199908496, 2184633395323803360 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,4
LINKS
MATHEMATICA
With[{nmax = 30}, CoefficientList[Series[Cos[Log[1 + x]/Cos[x]], {x, 0, nmax}], x]*Range[0, nmax]!] (* G. C. Greubel, Jul 22 2018 *)
PROG
(PARI) x='x+O('x^30); Vec(serlaplace(cos(log(1+x)/cos(x)))) \\ G. C. Greubel, Jul 22 2018
(Magma) m:=30; R<x>:=PowerSeriesRing(Rationals(), m); b:=Coefficients(R!(Cos(Log(1+x)/Cos(x)))); [Factorial(n-1)*b[n]: n in [1..m]]; // G. C. Greubel, Jul 22 2018
CROSSREFS
Sequence in context: A095663 A254332 A009029 * A221543 A309000 A352027
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)