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 A196581 #22 Aug 13 2020 14:02:28 %S A196581 88,122,123,192,148,241,198 %N A196581 Length of longest possible 30-degree snake inside a circle of diameter n. %C A196581 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 A196581 Erich Friedman, <a href="https://erich-friedman.github.io/mathmagic/0399.html">Problem of the month March 1999</a> %Y A196581 Cf. A196579, A196580, A196582, A196591. %K A196581 nonn,more %O A196581 5,1 %A A196581 _Kausthub Gudipati_, Oct 04 2011