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 A068610 #23 Jun 04 2019 02:49:57 %S A068610 1,18,7,24,11,14,5,20,23,10,3,16,19,22,9,12,15,6,21,8,25,2,13,4,17,66, %T A068610 39,70,43,76,47,80,51,28,55,58,33,62,37,68,41,72,75,46,79,50,27,54,31, %U A068610 60,35,64,67,40,71,74,45,78,49,52 %N A068610 Path of a knight's tour on an infinite chessboard. %C A068610 One of eight possible knight's tours. Squares are numbered in a clockwise spiral. Enumerates all positive integers. %H A068610 Hugo Pfoertner, <a href="/A068610/b068610.txt">Table of n, a(n) for n = 0..1088</a> [Offset adapted by _Georg Fischer_, Jun 04 2019] %H A068610 Frank Ellermann, <a href="http://oeis.org/A068225/a068225.html">Sequences based on a spiral of the natural numbers</a> %H A068610 Hugo Pfoertner, <a href="/A068610/a068610.png">Illustration of initial terms</a>. %Y A068610 Cf. A068608, A068609, A068611, A068612, A068613, A068614, A068615. %K A068610 nonn %O A068610 0,2 %A A068610 Hans Secelle and Albrecht Heeffer (albrecht.heeffer(AT)pandora.be), Mar 09 2002