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 A383083 #13 Apr 18 2025 21:51:18 %S A383083 1,2,1,4,44,1084,91192 %N A383083 The number of distinct straightedge-and-compass constructions that can be made with no lines and n circles. %C A383083 A straightedge-and-compass construction starts with 2 points marked on the plane, traditionally (0,0) and (1,0). In the constructions counted by this sequence, only the compass is used. Circles can be drawn at any marked point through any other marked point, and new points are marked where circles intersect. %H A383083 Wikipedia, <a href="https://en.wikipedia.org/wiki/Mohr%E2%80%93Mascheroni_theorem">Mohr-Mascheroni theorem</a> %H A383083 Peter Kagey, <a href="/A383083/a383083_1.png">Illustration of a(0)=1, a(1)=2, a(2)=1, and a(3)=4</a>. %H A383083 Peter Kagey, <a href="/A383083/a383083.png">Illustration of a(4)=44</a>. %Y A383083 Cf. A250001, A333944, A339266, A383082. %K A383083 nonn,more,hard %O A383083 0,2 %A A383083 _Peter Kagey_, Apr 16 2025