login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A279587 Coefficients in the expansion of 1/([r] + [2r]x + [3r]x^2 + ...); [ ] = floor, r = sqrt(2). 1
1, -2, 0, 3, -3, 0, 4, -7, 5, 5, -16, 15, 2, -26, 39, -19, -38, 92, -77, -34, 178, -220, 48, 293, -537, 343, 363, -1129, 1146, 94, -2050, 3029, -1290, -3039, 6855, -5577, -2738, 13513, -16417, 3007, 22633, -40108, 24584, 28535, -85117, 84600, 10247, -156524 (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 = sqrt(2).

MATHEMATICA

z = 30; r = Sqrt[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]  (* A279587 *)

CROSSREFS

Cf. A001951.

Sequence in context: A265020 A209703 A279779 * A127952 A171307 A209693

Adjacent sequences:  A279584 A279585 A279586 * A279588 A279589 A279590

KEYWORD

sign,easy

AUTHOR

Clark Kimberling, Dec 15 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified February 20 10:37 EST 2018. Contains 299385 sequences. (Running on oeis4.)