The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A279592 Coefficients in the expansion of 1/([r] + [2r]x + [3r]x^2 + ...); [ ] = floor, r = Pi/2. 1
 1, -3, 5, -9, 18, -36, 72, -144, 287, -570, 1132, -2250, 4473, -8892, 17676, -35137, 69847, -138845, 276002, -548649, 1090629, -2168001, 4309649, -8566912, 17029689, -33852374, 67293256, -133768530, 265911039, -528589801, 1050754338, -2088736250, 4152082903 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Clark Kimberling, Table of n, a(n) for n = 0..1000 FORMULA G.f.:  1/([r] + [2r]x + [3r]x^2 + ...); [ ] = floor, r = Pi/2. MATHEMATICA z = 30; r = Pi/2; f[x_] := f[x] = Sum[Floor[r*(k + 1)] x^k, {k, 0, z}]; f[x] CoefficientList[Series[1/f[x], {x, 0, 2*z}], x] PROG (PARI) r = Pi/2; Vec(1/sum(k=0, 70, floor(r*(k + 1))*x^k) + O(x^71)) \\ Indranil Ghosh, Mar 30 2017 CROSSREFS Cf. A279607. Sequence in context: A288230 A289262 A288231 * A288229 A293332 A288135 Adjacent sequences:  A279589 A279590 A279591 * A279593 A279594 A279595 KEYWORD sign,easy AUTHOR Clark Kimberling, Dec 16 2016 STATUS approved

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

Last modified September 19 18:37 EDT 2020. Contains 337181 sequences. (Running on oeis4.)