%I #21 Jun 09 2023 22:00:30
%S 2,8,2,2,8,5,5,8,5,5,8,2,2,8,2,2,8,5,5,8,5,5,8,2,2,8,2,2,8,5,5,8,5,5,
%T 8,2,2,8,2,2,8,5,5,8,5,5,8,2,2,8,2,2,8,5,5,8,5,5,8,2,2,8,2,2,8,5,5,8,
%U 5,5,8,2,2,8,2,2,8,5,5,8,5,5,8,2,2,8,2,2,8,5,5,8,5,5,8,2,2,8,2,2,8,5,5,8,5,5,8,2
%N Periodic with period 12: repeat [2,8,2,2,8,5,5,8,5,5,8,2].
%H <a href="/index/Rec#order_09">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,1,0,0,-1,0,0,1).
%F G.f.: ( -x*(2+8*x+2*x^2+3*x^5+5*x^6+8*x^7+2*x^8) ) / ( (x-1)*(x^2+1)*(1+x+x^2)*(x^4-x^2+1) ). - _R. J. Mathar_, Jul 02 2011
%F a(n) = a(n-3) - a(n-6) + a(n-9). - _Wesley Ivan Hurt_, Jun 09 2023
%t LinearRecurrence[{0, 0, 1, 0, 0, -1, 0, 0, 1},{2, 8, 2, 2, 8, 5, 5, 8, 5},108] (* _Ray Chandler_, Aug 27 2015 *)
%o (PARI) a(n)=[2,8,2,2,8,5,5,8,5,5,8,2][(n-1)%12+1]; \\ _Jinyuan Wang_, Feb 26 2020
%Y Cf. A181668.
%K nonn,easy
%O 1,1
%A _Paul Curtz_, Nov 25 2010
%E Extended by _Ray Chandler_, Aug 27 2015