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 A112297 #8 Dec 23 2024 14:53:42 %S A112297 470,384,294,150,153,520 %N A112297 A puzzle sequence, answer not known to me. %H A112297 Alonso Del Arte, <a href="https://web.archive.org/web/*/http://list.seqfan.eu/pipermail/seqfan/2005-November/043714.html">Posting to Seq Fan mailing list</a>, Nov 28 2005 %K A112297 nonn,more,unkn %O A112297 0,1 %A A112297 _N. J. A. Sloane_, Nov 30 2005