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 A366004 #9 Dec 04 2023 16:44:28 %S A366004 3,36,700,15426,368154 %N A366004 Number of fixed polyominoids with n cells, allowing right-angled corner-connections and right-angled edge-connections. %C A366004 See A365995 for further details and a table of related sequences. %H A366004 Wikipedia, <a href="https://en.wikipedia.org/wiki/Polyominoid">Polyominoid</a>. %H A366004 <a href="/index/Pol#polyominoes">Index entries for sequences related to polyominoes</a>. %Y A366004 Cf. A365995, A366003 (free). %Y A366004 25th row of A366767. %K A366004 nonn,hard,more %O A366004 1,1 %A A366004 _Pontus von Brömssen_, Sep 28 2023