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A279122
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Denominators of coefficients in expansion of 3/(1 + 2 cos(sqrt(x))).
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3
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1, 3, 12, 360, 181440, 1814400, 34214400, 130767436800, 10461394944000, 457312407552000, 3649353012264960000, 562000363888803840000, 3409057152380436480000, 5444434725209176080384000000, 152444172305856930250752000000, 18946632843727932759736320000000
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OFFSET
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0,2
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LINKS
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Clark Kimberling, Table of n, a(n) for n = 0..999
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EXAMPLE
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1/1 + (1/3)x + (1/12)x^2 + (7/360)x^3 + ... ; 1/1, 1/2, 1/12, 7/360, 809/181440, ... = A279122/A279121.
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MATHEMATICA
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Denominator[CoefficientList[Series[3/(1 + 2 Cos[Sqrt[x]]), {x, 0, 30}], x]]
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CROSSREFS
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Cf. A279120, A279122.
Sequence in context: A300532 A249940 A132515 * A246957 A216897 A262541
Adjacent sequences: A279119 A279120 A279121 * A279123 A279124 A279125
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KEYWORD
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nonn,easy,frac
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AUTHOR
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Clark Kimberling, Dec 07 2016
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STATUS
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approved
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