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 A372616 #10 May 10 2024 08:49:31 %S A372616 12,207,1104,4359,14880,32523,73662,121605,223290,329286,554286, %T A372616 722841,1145091 %N A372616 Number of curved edges among all distinct circles that can be constructed from the 3 vertices and the equally spaced 3*n points placed on the sides of an equilateral triangle, using only a compass. %C A372616 A circle is constructed for every pair of the 3 + 3*n points, the first point defines the circle's center while the second the radius distance. %C A372616 See A372614 and A372615 for images of the circles. %F A372616 a(n) = A372614(n) + A372615(n) - 1 by Euler's formula. %Y A372616 Cf. A372614 (vertices), A372615 (regions), A372617 (k-gons), A372682 (number of circles), A371375, A356358, A360353. %K A372616 nonn,more %O A372616 0,1 %A A372616 _Scott R. Shannon_, May 07 2024