This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A140976 #28 Dec 12 2023 08:31:42
%S A140976 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 A140976 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 A140976 0,0,8,8,6,6,4,4,2,2,0,0,8,8,6,6,4,4,2,2,0,0
%N A140976 Period length 10: repeat 8, 8, 6, 6, 4, 4, 2, 2, 0, 0.
%C A140976 The subsequence of even terms of A140975.
%H A140976 <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 A140976 Also doubled A059631(n+1) mod 10.
%F A140976 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 A140976 PadRight[{},100,{8,8,6,6,4,4,2,2,0,0}] (* _Harvey P. Dale_, Jun 03 2012 *)
%Y A140976 Cf. A059631, A140975, A177154.
%K A140976 nonn,easy,less
%O A140976 0,1
%A A140976 _Paul Curtz_, Jul 28 2008
%E A140976 More terms from _Jinyuan Wang_, Feb 26 2020