OFFSET
0,7
COMMENTS
The ratio a(n+1)/a(n) is 1.2934859531254534... for n->infinity.
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..1000
Michael Mossinghoff, Small Salem numbers
Index entries for linear recurrences with constant coefficients, signature (1,0,0,0,0,1,0,0,0,0,1,-1).
FORMULA
G.f.: 1/((1 - x + x^2)*(1 - x^2 - x^3 + x^5 - x^7 - x^8 + x^10)).
a(n) = a(n-1) + a(n-6) + a(n-11) - a(n-12), n >= 12. - Franck Maminirina Ramaharo, Oct 31 2018
MATHEMATICA
CoefficientList[Series[1/(1 - x - x^6 - x^11 + x^12), {x, 0, 50}], x]
PROG
(PARI) x='x+O('x^50); Vec(1/(1-x-x^6-x^11+x^12)) \\ G. C. Greubel, Nov 03 2018
(Magma) m:=50; R<x>:=PowerSeriesRing(Integers(), m); Coefficients(R!(1/(1-x-x^6-x^11+x^12))); // G. C. Greubel, Nov 03 2018
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Roger L. Bagula, Dec 04 2010
STATUS
approved