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A279310 Numerators of coefficients in expansion of (cos x)/(1 - x - x^2). 2
1, 1, 3, 5, 97, 157, 7619, 12329, 124121, 1807513, 263214179, 425890349, 90961797697, 29435864753, 1313384366851, 70128321031313, 2475709202997731, 44063598280490161, 21816698251120351811, 35300159324950341077, 7234801959635621099147, 2065792142493411347453 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

EXAMPLE

(1/1) + (1/1)x + (3/2)x^2 + (5/2)x^3 + ... ; 1/1, 1/1, 3/2, 5/2, ... = A279310/A279311.

MATHEMATICA

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

Numerator[t]   (* A279310 *)

Denominator[t] (* A279311 *)

CROSSREFS

Cf. A279311.

Sequence in context: A057663 A056244 A173487 * A103081 A234600 A003112

Adjacent sequences:  A279307 A279308 A279309 * A279311 A279312 A279313

KEYWORD

nonn,easy,frac

AUTHOR

Clark Kimberling, Dec 11 2016

STATUS

approved

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Last modified July 9 18:08 EDT 2020. Contains 335545 sequences. (Running on oeis4.)