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%I #28 Dec 12 2023 08:31:42
%S 8,8,6,6,4,4,2,2,0,0,8,8,6,6,4,4,2,2,0,0,8,8,6,6,4,4,2,2,0,0,8,8,6,6,
%T 4,4,2,2,0,0,8,8,6,6,4,4,2,2,0,0,8,8,6,6,4,4,2,2,0,0,8,8,6,6,4,4,2,2,
%U 0,0,8,8,6,6,4,4,2,2,0,0,8,8,6,6,4,4,2,2,0,0
%N Period length 10: repeat 8, 8, 6, 6, 4, 4, 2, 2, 0, 0.
%C The subsequence of even terms of A140975.
%H <a href="/index/Rec#order_09">Index entries for linear recurrences with constant coefficients</a>, signature (1,-1,1,-1,1,-1,1,-1,1).
%F Also doubled A059631(n+1) mod 10.
%F G.f.: ( -8-6*x^2-4*x^4-2*x^6 ) / ( (x-1)*(1+x+x^2+x^3+x^4)*(1-x+x^2-x^3+x^4) ). - _R. J. Mathar_, Jul 08 2011
%t PadRight[{},100,{8,8,6,6,4,4,2,2,0,0}] (* _Harvey P. Dale_, Jun 03 2012 *)
%Y Cf. A059631, A140975, A177154.
%K nonn,easy,less
%O 0,1
%A _Paul Curtz_, Jul 28 2008
%E More terms from _Jinyuan Wang_, Feb 26 2020
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