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 A089891 #11 Nov 10 2023 03:03:02 %S A089891 1,1,1,2,3,5,12,21 %N A089891 Number of knots and links with unknotting (unlinking) number U=1. %D A089891 A. Kawauchi, A Survey of Knot Theory, Birkhäuser, Basel, Boston, Berlin, 1996. %H A089891 Slavik Jablan, <a href="http://www.mi.sanu.ac.rs/vismath/sl/index.html">Ordering Knots</a>. %H A089891 Slavik Jablan and Radmila Sazdanovic, <a href="http://www.mi.sanu.ac.rs/vismath/linknot/index.html">LinKnot</a>. %H A089891 P. Kohn, <a href="https://projecteuclid.org/journals/osaka-journal-of-mathematics/volume-30/issue-4/Unlinking-two-component-links/ojm/1200784732.full">Unlinking two component links</a>, Osaka J. Math. 30(4), 741-752 (1993). %Y A089891 Cf. A078477. %K A089891 nonn,more %O A089891 2,4 %A A089891 Slavik Jablan and Radmila Sazdanovic, Jan 10 2004