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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A008618 Expansion of 1/((1-x^2)(1-x^9)). 1
1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 3, 4, 3, 4, 3, 4, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 4, 5, 4, 5, 4 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,19

REFERENCES

D. J. Benson, Polynomial Invariants of Finite Groups, Cambridge, 1993, p. 100.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

D. J. Benson, Polynomial Invariants of Finite Groups, Cambridge, 1993, p. 100.

INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 215

Index entries for linear recurrences with constant coefficients, signature (0, 1, 0, 0, 0, 0, 0, 0, 1, 0, -1).

FORMULA

a(n) = floor((2*n+27+9*(-1)^n)/36). - Tani Akinari, May 19 2014

MATHEMATICA

CoefficientList[Series[1 / ((1 - x^2) (1 - x^9)), {x, 0, 100}], x] (* Vincenzo Librandi, Jun 22 2013 *)

PROG

(PARI) a(n)=floor((2*n+27+9*(-1)^n)/36) \\ Tani Akinari, May 19 2014

CROSSREFS

Sequence in context: A298475 A175096 A111627 * A225572 A318471 A161234

Adjacent sequences:  A008615 A008616 A008617 * A008619 A008620 A008621

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

EXTENSIONS

Typo in name fixed by Vincenzo Librandi, Jun 22 2013

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 23 19:07 EDT 2019. Contains 323528 sequences. (Running on oeis4.)