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 A361622 #9 Mar 20 2023 10:39:26 %S A361622 13,46,99,164,257,370,503,648,821,1014,1227,1444,1697,1970,2255 %N A361622 Number of distinct circles that can be constructed from a point on the origin and n equally spaced points on each of the +x,-x,+y,-y coordinates axes using only a compass. %C A361622 A circle is constructed for every pair of the 1 + 4n points, the first point defines the circle's center while the second the radius distance. %C A361622 No formula for a(n) is known. %C A361622 See A354605 and A353782 for images of the resulting vertices and regions. %Y A361622 Cf. A354605 (vertices), A353782 (regions), A356358 (edges), A361623 (k-gons) %K A361622 nonn,more %O A361622 1,1 %A A361622 _Scott R. Shannon_, Mar 18 2023