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. 3.4.
Index entries for linear recurrences with constant coefficients, signature (5,-4,4).
FORMULA
a(n) = 5*a(n-1)-4*a(n-2)+4*a(n-3) for n>2. - Colin Barker, Aug 26 2016
PROG
(PARI) Vec((1+4*x^2)/(1-5*x+4*x^2-4*x^3) + O(x^40)) \\ Colin Barker, Aug 26 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Aug 25 2016
STATUS
approved