|
|
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
|
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
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|