%I #19 Aug 10 2023 14:06:23
%S 0,6,0,6,0,6,0,6,0,6,0,6,0,6,0,6,0,6,0,6,0,6,0,6,0,6,0,6,0,6,0,6,0,6,
%T 0,6,0,6,0,6,0,6,0,6,0,6,0,6,0,6,0,6,0,6,0,6,0,6,0,6,0,6,0,6,0,6,0,6,
%U 0,6,0,6,0,6,0,6,0,6,0,6,0
%N Period 2: repeat (0,6).
%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (0,1).
%F a(n) = 3*[1-(-1)^n] = 6*(n mod 2). - _Paolo P. Lava_, Oct 20 2006
%F G.f. 6x/((1-x)(1+x)). - _R. J. Mathar_, Nov 21 2011
%t Table[6 Mod[n, 2], {n, 0, 50}] (* _Jinyuan Wang_, Feb 26 2020 *)
%t PadRight[{},100,{0,6}] (* _Harvey P. Dale_, Aug 10 2023 *)
%o (PARI) a(n)=n%2*6 \\ _Charles R Greathouse IV_, Jul 13 2016
%K nonn,easy
%O 0,2
%A _N. J. A. Sloane_