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 A196591 #20 Aug 13 2020 14:02:28 %S A196591 168,243,244,371,311 %N A196591 Length of the longest possible 45-degree snake inside a circle of diameter n. %C A196591 A snake is a sequence of unit line segments that are non-overlapping except that each one begins where the previous one ends. A d-degree snake is a snake all of whose angles with the horizontal are multiples of d. %H A196591 Erich Friedman, <a href="https://erich-friedman.github.io/mathmagic/0503.html">Problem of the month May 2003</a> %Y A196591 Cf. A196579, A196580, A196581, A196582. %K A196591 nonn,more %O A196591 5,1 %A A196591 _Kausthub Gudipati_, Oct 04 2011