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 A306660 #22 May 07 2019 13:57:06 %S A306660 0,1,2,1,-1,-2,0,2,1,-1,-2,-1,1,2,0,-2,-1,1,2,0,-2,-1,-2,0,2,4,3,4,3, %T A306660 1,-1,-3,-4,-3,-4,-3,-1,1,3,4,3,4,2,0,-2,-4,-3,-4,-3,-1,1,3,4,3,4,3,1, %U A306660 -1,-3,-4,-3,-4,-2,0,2,3,4,3,4,2,0,-2,-4,-3,-4,-3,-4 %N A306660 y-coordinates corresponding to the knight's tour described in A306659. %C A306660 See A306659. %H A306660 Hugo Pfoertner, <a href="/A306660/b306660.txt">Table of n, a(n) for n = 1..1089</a> %H A306660 Hugo Pfoertner, <a href="http://oeis.org/plot2a?name1=A306659&name2=A306660&tform1=untransformed&tform2=untransformed&shift=0&radiop1=xy&drawpoints=true&drawlines=true">Illustration of tour using Plot 2</a>. %Y A306660 Cf. A068610, A306659. %K A306660 sign %O A306660 1,3 %A A306660 _Hugo Pfoertner_, May 05 2019