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 A373106 #7 May 26 2024 08:20:32 %S A373106 5,61,677,2533,7705,17269,37161,65089,111877,174545,274213 %N A373106 Number of vertices among all distinct circles that can be constructed from the 4 vertices and the equally spaced 4*n points placed on the sides of a square when every pair of the 4 + 4*n points are connected by a circle and where the points lie at the ends of the circle's diameter. %C A373106 A circle is constructed for every pair of the 4 + 4*n points, the two points lying at the ends of a diameter of the circle. %H A373106 Scott R. Shannon, <a href="/A373106/a373106.jpg">Image for n = 0</a>. In this and other images the 4 + 4*n vertices forming the square are drawn larger for clarity. %H A373106 Scott R. Shannon, <a href="/A373106/a373106_1.jpg">Image for n = 1</a>. %H A373106 Scott R. Shannon, <a href="/A373106/a373106_2.jpg">Image for n = 2</a>. %H A373106 Scott R. Shannon, <a href="/A373106/a373106_3.jpg">Image for n = 3</a>. %F A373106 a(n) = A373108(n) - A373107(n) + 1 by Euler's formula. %Y A373106 Cf. A373107 (regions), A373108 (edges), A373109 (k-gons), A373110 (circles), A372977, A372731, A358746, A362233, A360351. %K A373106 nonn,more %O A373106 0,1 %A A373106 _Scott R. Shannon_, May 25 2024