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 A068615 #18 Jun 04 2019 02:49:51 %S A068615 1,16,3,10,23,20,5,14,11,24,7,18,15,12,9,22,19,4,13,2,25,8,21,6,17,64, %T A068615 35,60,31,54,27,50,79,46,75,72,41,68,37,62,33,58,55,28,51,80,47,76,43, %U A068615 70,39,66,63,34,59,56,29,52,49,78 %N A068615 Path of a knight's tour on an infinite chessboard. %C A068615 One of eight possible knight's tours. Squares are numbered in a clockwise spiral. Enumerates all positive integers. %H A068615 Hugo Pfoertner, <a href="/A068615/b068615.txt">Table of n, a(n) for n = 0..1088</a> [Offset adapted by _Georg Fischer_, Jun 04 2019] %H A068615 Frank Ellermann, <a href="http://oeis.org/A068225/a068225.html">Sequences based on a spiral of the natural numbers</a> %Y A068615 Cf. A068608, A068609, A068610, A068611, A068612, A068613, A068614. %K A068615 nonn %O A068615 0,2 %A A068615 Hans Secelle and Albrecht Heeffer (albrecht.heeffer(AT)pandora.be), Mar 09 2002