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 A279240 Denominators of coefficients in expansion of (2 cos x)/(1 + cos(sqrt(x))). 3
 1, 4, 24, 2880, 40320, 7257600, 479001600, 697426329600, 20922789888000, 261321375744000, 221172909834240000, 4496002911110430720000, 620448401733239439360000, 806582922253211271168000000, 304888344611713860501504000000, 4244045756995056938180935680000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Clark Kimberling, Table of n, a(n) for n = 0..1000 EXAMPLE (1/1) + (1/4)x - (11/24)x^2 - (343/2880)x^3 + (871/40320)x^4 + ... ; 1/1, 1/4, -11/24, -343/2880, ... = A279238/A279240. MATHEMATICA z = 26; CoefficientList[Series[2 Cos[x]/(1 + Cos[Sqrt[x]]), {x, 0, z}], x]; CROSSREFS Cf. A279238, A279239. Sequence in context: A108185 A110972 A065711 * A279110 A077093 A077092 Adjacent sequences: A279237 A279238 A279239 * A279241 A279242 A279243 KEYWORD nonn,easy,frac AUTHOR Clark Kimberling, Dec 08 2016 STATUS approved

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Last modified November 30 21:14 EST 2023. Contains 367462 sequences. (Running on oeis4.)