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 A366007 #10 Nov 04 2023 18:24:44 %S A366007 1,3,25,431,10175 %N A366007 Number of free polyominoids with n cells, allowing any corner-connections and flat edge-connections. %C A366007 See A365995 for further details and a table of related sequences. %H A366007 Pontus von Brömssen, <a href="/A366007/a366007.svg">Illustration for sizes 1..3</a>. %H A366007 Wikipedia, <a href="https://en.wikipedia.org/wiki/Polyominoid">Polyominoid</a>. %H A366007 <a href="/index/Pol#polyominoes">Index entries for sequences related to polyominoes</a>. %Y A366007 Cf. A365995, A366008 (fixed). %Y A366007 28th row of A366766. %K A366007 nonn,hard,more %O A366007 1,2 %A A366007 _Pontus von Brömssen_, Sep 28 2023