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A279311
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Denominators of coefficients in expansion of (cos x)/(1 - x - x^2).
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2
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1, 1, 2, 2, 24, 24, 720, 720, 4480, 40320, 3628800, 3628800, 479001600, 95800320, 2641766400, 87178291200, 1902071808000, 20922789888000, 6402373705728000, 6402373705728000, 810967336058880000, 143111882833920000, 66117689869271040000, 13223537973854208000
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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) + (1/1)x + (3/2)x^2 + (5/2)x^3 + ... ; 1/1, 1/1, 3/2, 5/2, ... = A279310/A279311.
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MATHEMATICA
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z = 30; t = CoefficientList[Series[Cos[x]/(1 - x - x^2), {x, 0, z}], x];
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CROSSREFS
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KEYWORD
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nonn,easy,frac
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AUTHOR
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STATUS
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approved
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