A279333 - OEIS

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A279333

Denominators of coefficients in expansion of (sin(x))/(1 - x - x^2).

1, 1, 1, 6, 6, 40, 120, 5040, 1008, 362880, 362880, 13305600, 39916800, 6227020800, 6227020800, 1307674368000, 1307674368000, 39520825344000, 14227497123840, 121645100408832000, 121645100408832000, 51090942171709440000, 51090942171709440000

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,4

LINKS

Clark Kimberling, Table of n, a(n) for n = 0..1000

EXAMPLE

(0/1) + (1/1)x + (1/1)x^2 + (11/6)x^3 + (17/6)x^4 ... ; 0/1, 1/1, 1/1, 11/6, ... = A279332/A279333.

MATHEMATICA

z = 30; t = CoefficientList[Series[Sin[x]/(1 - x - x^2), {x, 0, z}], x];

Numerator[t] (* A279332 *)

Denominator[t] (* A279333 *)

CROSSREFS