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%I #15 Dec 14 2023 05:11:57
%S 0,0,1,1,2,2,1,0,2,0,0,1,1,2,2,1,0,2,0,0,1,1,2,2,1,0,2,0,0,1,1,2,2,1,
%T 0,2,0,0,1,1,2,2,1,0,2,0,0,1,1,2,2,1,0,2,0,0,1,1,2,2,1,0,2,0,0,1,1,2,
%U 2,1,0,2,0,0,1,1,2,2,1,0,2,0,0,1,1,2,2,1,0,2,0,0,1,1,2,2,1,0,2
%N A de Bruijn sequence of length 9 over {0, 1, 2}, repeated.
%C Each of the 9 pairs 00, 01, ..., 22 occurs exactly once in each period.
%H F. Mendivil, <a href="https://www.maa.org/programs/maa-awards/writing-awards/fractals-graphs-and-fields">Fractals, graphs and fields</a>, Amer. Math. Monthly, 110 (No. 6, 2003), 503-515.
%t PadRight[{},99,{0,0,1,1,2,2,1,0,2}] (* _Harvey P. Dale_, Nov 23 2011 *)
%K nonn
%O 0,5
%A _N. J. A. Sloane_, Jun 14 2003
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