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 A068611 #19 Jun 04 2019 02:50:27 %S A068611 1,22,9,12,15,18,7,24,11,14,5,20,23,10,3,16,19,8,25,2,13,4,17,6,21,74, %T A068611 45,78,49,52,29,56,59,34,63,66,39,70,43,76,47,80,51,28,55,58,33,62,37, %U A068611 68,41,72,75,46,79,50,27,54,31,60 %N A068611 Path of a knight's tour on an infinite chessboard. %C A068611 One of eight possible knight's tours. Squares are numbered in a clockwise spiral. Enumerates all positive integers. %H A068611 Hugo Pfoertner, <a href="/A068611/b068611.txt">Table of n, a(n) for n = 0..1088</a> [Offset adapted by _Georg Fischer_, Jun 04 2019] %H A068611 Frank Ellermann, <a href="http://oeis.org/A068225/a068225.html">Sequences based on a spiral of the natural numbers</a> %Y A068611 Cf. A068608, A068609, A068610, A068612, A068613, A068614, A068615. %K A068611 nonn %O A068611 0,2 %A A068611 Hans Secelle and Albrecht Heeffer (albrecht.heeffer(AT)pandora.be), Mar 09 2002