OFFSET
1,6
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
R. Bisdorff and J.-L. Marichal, Counting non-isomorphic maximal independent sets of the n-cycle graph, arXiv:math/0701647 [math.CO], 2007-2008 and JIS 11 (2008) 08.5.7.
Index entries for linear recurrences with constant coefficients, signature (0,0,0,1,0,1).
FORMULA
a(n) = a(n-4) + a(n-6).
G.f.: -x^2*(x^4+x^3+x^2+x+1) / (x^6+x^4-1). - Colin Barker, Mar 29 2014
MATHEMATICA
Rest[CoefficientList[Series[-x^2*(x^4+x^3+x^2+x+1)/(x^6+x^4-1), {x, 0, 63}], x]] (* Vaclav Kotesovec, Mar 29 2014 *)
LinearRecurrence[{0, 0, 0, 1, 0, 1}, {0, 1, 1, 1, 1, 2}, 70] (* Harvey P. Dale, Jul 17 2014 *)
PROG
(PARI) concat(0, Vec(-x^2*(x^4+x^3+x^2+x+1)/(x^6+x^4-1) + O(x^100))) \\ Colin Barker, Mar 29 2014
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Jean-Luc Marichal (jean-luc.marichal(AT)uni.lu), Jan 24 2007
STATUS
approved