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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.

A152855 Period 5: Repeat [1, 2, 0, 2, 0].

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%I A152855 #15 Jan 20 2024 18:28:55
%S A152855 1,2,0,2,0,1,2,0,2,0,1,2,0,2,0,1,2,0,2,0,1,2,0,2,0,1,2,0,2,0,1,2,0,2,
%T A152855 0,1,2,0,2,0,1,2,0,2,0,1,2,0,2,0,1,2,0,2,0,1,2,0,2,0,1,2,0,2,0,1,2,0,
%U A152855 2,0,1,2,0,2,0,1,2,0,2,0,1,2,0,2,0,1,2,0,2,0,1,2,0,2,0,1,2,0,2,0,1,2,0,2,0
%N A152855 Period 5: Repeat [1, 2, 0, 2, 0].
%H A152855 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,0,0,1)
%F A152855 a(n+5) = a(n) with a(0) = 1, a(1) = a(3) = 2 and a(2) = a(4) = 0.
%F A152855 O.g.f.: f(z) = (1+2*z+2*z^3)/(1-z^5).
%F A152855 a(n) = 1+(-1/5*((5-5^(1/2))^(1/2)-(5+5^(1/2))^(1/2))*2^(1/2))*sin(2*n*Pi/5)+(1/5*((5-5^(1/2))^(1/2)+(5+5^(1/2))^(1/2))*2^(1/2))*sin(4*n*Pi/5).
%t A152855 PadRight[{},120,{1,2,0,2,0}] (* _Harvey P. Dale_, Dec 17 2022 *)
%Y A152855 Cf. A026039.
%K A152855 easy,nonn
%O A152855 0,2
%A A152855 _Richard Choulet_, Dec 14 2008