%I #16 Dec 11 2023 12:23:19
%S 2,3,0,-4,-5,-2,2,3,0,-4,-5,-2,2,3,0,-4,-5,-2,2,3,0,-4,-5,-2,2,3,0,-4,
%T -5,-2,2,3,0,-4,-5,-2,2,3,0,-4,-5,-2,2,3,0,-4,-5,-2,2,3,0,-4,-5,-2,2,
%U 3,0,-4,-5,-2,2,3,0,-4,-5,-2,2,3,0,-4,-5,-2,2,3,0,-4,-5,-2,2,3
%N Expansion of g.f. (2-x-2*x^2)/((1-x)*(1-x+x^2)).
%C A period 6 sequence. - _Christian Krause_, Dec 07 2023
%H <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (2,-2,1).
%F G.f.: (2-x-2*x^2)/((1-x)*(1-x+x^2)).
%F a(n) = a(n-1) - a(n-2) - 1. - _Christian Krause_, Dec 07 2023
%F a(n) = 5*sin(n*Pi/3)/sqrt(3) + 3*cos(n*Pi/3) - 1. - _Wesley Ivan Hurt_, Dec 09 2023
%K sign,easy
%O 0,1
%A _N. J. A. Sloane_