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 A385159 #11 Jul 24 2025 09:31:36 %S A385159 1,18,99,280,633,1098,1915,2928,4329,6010,8331,10752,14113,17778,21987 %N A385159 Place a point on the integer coordinates, up to |n|, along all four axial directions on a Cartesian plane, and then join a circle through every unordered triple of non-collinear points: a(n) is the number of distinct circles created. %H A385159 Scott R. Shannon, <a href="/A385159/a385159.jpg">Image for n = 2</a>. The 4 x 2 = 8 starting points are shown as white dots. %Y A385159 Cf. A385160 (vertices), A385161 (regions), A385162 (edges), A361622, A384700, A373110, A372735, A365669. %K A385159 nonn,more %O A385159 1,2 %A A385159 _Scott R. Shannon_, Jun 20 2025