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 A366340 #12 Nov 03 2023 17:01:16 %S A366340 1,1,5,19,123,954,9324 %N A366340 Number of free (4,3)-polyominoids with n cells, allowing right-angled (or hard) connections only. %C A366340 Two cubes sharing a face have a right-angled connection if they do not lie in the same 3-dimensional affine subspace. %C A366340 Connections that are not right-angled (flat connections) may occur, but the polyominoids considered here must be connected through right-angled connections only. %C A366340 Also, number of free polysticks in 4 dimensions with right-angled connections. %H A366340 Wikipedia, <a href="https://en.wikipedia.org/wiki/Polyominoid">Polyominoid</a>. %H A366340 <a href="/index/Pol#polyominoes">Index entries for sequences related to polyominoes</a>. %Y A366340 41st and 77th row of A366766. %Y A366340 Cf. A075679, A365654, A366336, A366338, A366341 (fixed). %K A366340 nonn,hard,more %O A366340 1,3 %A A366340 _Pontus von Brömssen_, Oct 07 2023