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 A089892 #11 Nov 10 2023 03:02:04 %S A089892 1,1,1,3,3,9,17,44 %N A089892 Number of knots with unknotting number U=1. %D A089892 A. Kawauchi, A Survey of Knot Theory, Birkhäuser, Basel, Boston, Berlin, 1996. %H A089892 Slavik Jablan, <a href="http://www.mi.sanu.ac.rs/vismath/sl/index.html">Ordering Knots</a>. %H A089892 Slavik Jablan and Radmila Sazdanovic, <a href="http://www.mi.sanu.ac.rs/vismath/linknot/index.html">LinKnot</a>. %Y A089892 Cf. A078477. %K A089892 nonn,more %O A089892 3,4 %A A089892 Slavik Jablan and Radmila Sazdanovic, Jan 10 2004