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%I #24 Mar 17 2024 05:53:19
%S 0,0,0,0,1,1,1,2,2,2,2,0,0,0,1,1,1,1,2,2,2,0,0,0,0,1,1,1,2,2,2,2,0,0,
%T 0,1,1,1,1,2,2,2,0,0,0,0,1,1,1,2,2,2,2,0,0,0,1,1,1,1,2,2,2,0,0,0,0,1,
%U 1,1,2,2,2,2,0,0,0,1,1,1,1,2,2,2,0,0,0,0,1,1,1,2,2,2,2,0,0,0,1,1,1,1,2,2,2
%N Periodic sequence of period 21.
%C See related comments in A122878.
%H <a href="/index/Rec#order_15">Index entries for linear recurrences with constant coefficients</a>, signature (1,0,0,0,0,0,-1,1,0,0,0,0,0,-1,1).
%F a(n+21) = a(n).
%F G.f.: -x^5*(2*x^10-x^7+x^3+1) / ((x-1)*(x^2+x+1)*(x^12-x^11+x^9-x^8+x^6 -x^4+x^3-x+1)). - _Colin Barker_, Dec 21 2012
%t PadRight[{},120,{0,0,0,0,1,1,1,2,2,2,2,0,0,0,1,1,1,1,2,2,2}] (* _Harvey P. Dale_, Dec 27 2016 *)
%Y Cf. A122878.
%K nonn,easy
%O 1,8
%A _Rick L. Shepherd_, Sep 16 2006
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