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 A323134 #14 Jan 27 2019 18:59:19 %S A323134 0,3,13,178,3031,64866 %N A323134 Number of polygons made of uncrossed knight's paths of length 2*n on an infinite board. %H A323134 Hugo Pfoertner, <a href="http://www.randomwalk.de/sequences/a323134.htm">Illustrations of uncrossed Knight's path polygons</a>, (2019). %e A323134 See Pfoertner link. %Y A323134 Cf. A003192, A157416, A258206, A266549, A284869, A316198. %K A323134 nonn,hard,more %O A323134 1,2 %A A323134 _Hugo Pfoertner_, Jan 05 2019