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 A105367 #16 Dec 14 2023 05:17:54
%S A105367 1,0,0,-1,0,1,0,0,-1,0,1,0,0,-1,0,1,0,0,-1,0,1,0,0,-1,0,1,0,0,-1,0,1,
%T A105367 0,0,-1,0,1,0,0,-1,0,1,0,0,-1,0,1,0,0,-1,0,1,0,0,-1,0,1,0,0,-1,0,1,0,
%U A105367 0,-1,0,1,0,0,-1,0,1,0,0,-1,0,1,0,0,-1,0,1,0,0,-1,0,1,0
%N A105367 Expansion of (1-x^3)/(1-x^5).
%C A105367 Periodic {1,0,0,-1,0}. Partial sums of A105368. Binomial transform of A105370.
%H A105367 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (-1,-1,-1,-1).
%F A105367 G.f.: (1+x+x^2)/(1+x+x^2+x^3+x^4);
%F A105367 a(n) = sqrt(2/5 - 2*sqrt(5)/25)*cos(4*Pi*n/5 + 3*Pi/10) + sqrt(2/5 + 2*sqrt(5)/25)*sin(2*Pi*n/5 + 2*Pi/5).
%K A105367 easy,sign
%O A105367 0,1
%A A105367 _Paul Barry_, Apr 01 2005