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 (1,7,12,6,7,4,2).
FORMULA
a(n) = 2*a(n-1)+6*a(n-2)+5*a(n-3)-6*a(n-4)+a(n-5)-3*a(n-6)-2*a(n-7)-2*a(n-8) for n>6. - Colin Barker, Aug 26 2016
PROG
(PARI) Vec((1+4*x+8*x^2+8*x^3+7*x^4+4*x^5+2*x^6)/(1-x-7*x^2-12*x^3-6*x^4-7*x^5-4*x^6-2*x^7) + O(x^30)) \\ Colin Barker, Aug 26 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Aug 26 2016
STATUS
approved