The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A279334 Numerators of coefficients in expansion of exp(x)/(1 - x - x^2). 2
 1, 2, 7, 17, 221, 893, 17347, 98221, 2542969, 2645039, 599172671, 5332129721, 207061905877, 2177714624677, 98661276360571, 1197279643886453, 8855950704414791, 5962161748599967, 49662655090649112439, 69398245985290595843, 2906296303998501464573 (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) + (2/1)x + (7/2)x^2 + (17/3)x^3 + (221/24)x^4 ... ; 1/1, 2/1, 7/2, 17/3, ... = A279334/A279335. MATHEMATICA z = 30; t = CoefficientList[Series[E^x/(1 - x - x^2), {x, 0, z}], x]; Numerator[t] (* A279334 *) Denominator[t] (* A279335 *) PROG (PARI) my(x='x+O('x^25)); apply(numerator, Vec(exp(x)/(1 - x - x^2))) \\ Michel Marcus, Feb 06 2021 CROSSREFS Cf. A279335. Sequence in context: A028888 A082627 A160617 * A283957 A013062 A013092 Adjacent sequences: A279331 A279332 A279333 * A279335 A279336 A279337 KEYWORD nonn,easy,frac AUTHOR Clark Kimberling, Dec 12 2016 EXTENSIONS Definition corrected by Georg Fischer, Feb 06 2021 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified November 28 17:03 EST 2023. Contains 367419 sequences. (Running on oeis4.)