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 A372979 #6 May 19 2024 08:53:40 %S A372979 84,1180,8836,29980,80564,193172,403780,654196,1159780 %N A372979 Number of edges 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, using only a compass. %C A372979 A circle is constructed for every pair of the 4 + 4*n points, the first point defines the circle's center while the second the radius distance. %C A372979 See A372977 and A372978 for images of the circles. %F A372979 a(n) = A372977(n) + A372978(n) - 1 by Euler's formula. %Y A372979 Cf. A372977 (vertices), A372978 (regions), A372980 (k-gons), A372981 (circles), A372616, A371375, A356358, A360353. %K A372979 nonn,more %O A372979 0,1 %A A372979 _Scott R. Shannon_, May 19 2024