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 A339266 #12 Dec 24 2020 21:13:34 %S A339266 1,1,1,4,29 %N A339266 Numbers of connected arrangements of n equal circles in the affine plane, in the sense that the union of the boundaries of the circles is a connected set. %H A339266 Ya-Ping Lu, <a href="/A339266/a339266.pdf">Configurations for a(1) through a(4)</a> %H A339266 Jon Wild, <a href="/A250001/a250001_4.pdf">Illustrations of the 173 configurations of four circles</a> %e A339266 Configurations for a(1) through a(4) are given in the links. %Y A339266 Cf. A250001, A275923, A275924, A288554-A288568, A296407 %K A339266 nonn,more %O A339266 0,4 %A A339266 _Ya-Ping Lu_, Nov 29 2020