OFFSET
0,8
REFERENCES
J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. xxxiii.
LINKS
Index entries for linear recurrences with constant coefficients, signature (0, -1, 0, -1, -1, -1, 0, 0, 0, -1, -1).
FORMULA
G.f.: 1/(x^11 + x^10 + x^6 + x^5 + x^4 + x^2 + 1).
a(n) + a(n-2) + a(n-4) + a(n-5) + a(n-6) + a(n-10) + a(n-11) = 0. - Wesley Ivan Hurt, Dec 29 2023
MATHEMATICA
f[x_] = 1 + x + x^5 + x^6 + x^7 + x^9 + x^11;
g[x] = ExpandAll[x^11*f[1/x]];
a = Table[SeriesCoefficient[ Series[1/g[x], {x, 0, 50}], n], {n, 0, 50}]
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Roger L. Bagula, Mar 05 2009
EXTENSIONS
New name, Joerg Arndt, Mar 20 2013
STATUS
approved