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 A383085 #10 Apr 18 2025 21:53:36 %S A383085 2,2,4,10,52,1704,214135 %N A383085 The number of points in the Euclidean plane that can be determined via a straightedge-and-compass construction using no lines and n or fewer circles. %C A383085 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 A383085 Peter Kagey, <a href="/A383085/a383085.png">Illustration of the a(5)=1704 points</a>. %H A383085 Wikipedia, <a href="https://en.wikipedia.org/wiki/Mohr%E2%80%93Mascheroni_theorem">Mohr-Mascheroni theorem</a> %Y A383085 Cf. A383083, A383084. %K A383085 nonn,hard,more %O A383085 0,1 %A A383085 _Peter Kagey_, Apr 16 2025