OFFSET
0,2
LINKS
Colin Barker, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (2,9).
FORMULA
a(n) = 2*a(n-1) + 9*a(n-2) for n>1. - Colin Barker, Oct 21 2019
a(n)/a(n-1) ~ 1 + sqrt(10).
PROG
(PARI) Vec((1 + 7*x) / (1 - 2*x - 9*x^2) + O(x^30)) \\ Colin Barker, Dec 13 2019
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Kyle MacLean Smith, Oct 20 2019
EXTENSIONS
Edited by N. J. A. Sloane, Dec 05 2019
STATUS
approved