OFFSET
0,2
LINKS
Colin Barker, Table of n, a(n) for n = 0..1000
T. Doslic, T. Short, Maximal matchings in polyspiro and benzenoid chains, arXiv:1511.00590, [math.CO], 2015. See Th. 4.4.
Index entries for linear recurrences with constant coefficients, signature (4,0,0,1,1).
FORMULA
G.f.: (1+x-x^3) / (1-4*x-x^4-x^5).
a(n) = 4*a(n-1)+a(n-4)+a(n-5) for n>4. - Colin Barker, Aug 26 2016
MATHEMATICA
CoefficientList[Series[(1 + x - x^3)/(1 - 4*x - x^4 - x^5), {x, 0, 30}], x] (* Wesley Ivan Hurt, Sep 05 2022 *)
PROG
(PARI) Vec((1+x-x^3)/(1-4*x-x^4-x^5) + O(x^30)) \\ Colin Barker, Aug 26 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Aug 25 2016
STATUS
approved