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 A357083 #11 Sep 13 2022 09:33:57 %S A357083 11,215,3173,38564 %N A357083 a(n) is the number of free polycubes of size n with holes. %H A357083 Wikipedia, <a href="https://en.wikipedia.org/wiki/Polycube">Polycube</a>. %Y A357083 Cf. A038119, A355966 (which distinguishes reflections). %K A357083 nonn,more,hard %O A357083 11,1 %A A357083 _John Mason_, Sep 11 2022