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 (6,-3,2).
FORMULA
a(n) = 6*a(n-1)-3*a(n-2)+2*a(n-3) for n>2. - Colin Barker, Aug 26 2016
MATHEMATICA
CoefficientList[Series[(1-x-2x^2)/(1-6x+3x^2-2x^3), {x, 0, 40}], x] (* or *) LinearRecurrence[{6, -3, 2}, {1, 5, 25}, 40] (* Harvey P. Dale, May 14 2019 *)
PROG
(PARI) Vec((1-x-2*x^2)/(1-6*x+3*x^2-2*x^3) + O(x^30)) \\ Colin Barker, Aug 26 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Aug 25 2016
STATUS
approved