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A279235
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Numerators of coefficients in expansion of 1/(2 - cos(sqrt(x))).
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2
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1, -1, 7, -121, 3907, -28963, 15430207, -1619195761, 415698113, -39531606447181, 787393078729637, -329597897026412143, 56485166839707031039, -25018119236152953236111, 17136704858994825564634201, -5470262193930829308041366531, 34416659770990341862308561437707
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OFFSET
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0,3
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LINKS
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EXAMPLE
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(1/1) - (1/2)x + (7/24)x^2 - (121/720)x^3 + ... ; 1/1, -1/2, 7/24, 1/6480, -121/720, ... = A279235/A279236.
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MATHEMATICA
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z = 26; t = CoefficientList[Series[1/(2 - Cos[Sqrt[x]]), {x, 0, z}], x];
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CROSSREFS
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KEYWORD
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sign,easy,frac
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AUTHOR
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STATUS
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approved
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