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 A371255 #13 Mar 23 2024 21:19:05 %S A371255 1,2,9,8,40,24,168,152,477,490,1199,912,2418,2464,4230,4464,7769,6894, %T A371255 12369,12400,18606,19008,27784,26376,39575,39390,54027,54432,73254, %U A371255 68340,96410,96800,124443,125222,159005,156168,200540,201932,248508,250120 %N A371255 Number of (curved) edges formed when n equally spaced points are placed around a circle and all pairs of points are joined by an interior arc whose radius equals the circle's radius. %C A371255 See A371253 and A371254 for images of the circles. %F A371255 a(n) = A371253(n) + A371254(n) - 1 by Euler's formula. %Y A371255 Cf. A371253 (regions), A371254 (vertices), A371274 (k-gons), A135565, A358783, A359047, A359254. %K A371255 nonn %O A371255 1,2 %A A371255 _Scott R. Shannon_, Mar 16 2024