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%I #18 Jun 04 2019 02:50:36
%S 1,20,5,14,11,24,7,18,15,12,9,22,19,16,3,10,23,6,17,4,13,2,25,8,21,72,
%T 41,68,37,62,33,58,55,28,51,80,47,76,43,70,39,66,63,34,59,56,29,52,49,
%U 78,45,74,71,40,67,64,35,60,31,54
%N Path of a knight's tour on an infinite chessboard.
%C One of eight possible knight's tours. Squares are numbered in a clockwise spiral. Enumerates all positive integers.
%H Hugo Pfoertner, <a href="/A068612/b068612.txt">Table of n, a(n) for n = 0..1088</a> [Offset adapted by _Georg Fischer_, Jun 04 2019]
%H Frank Ellermann, <a href="http://oeis.org/A068225/a068225.html">Sequences based on a spiral of the natural numbers</a>
%Y Cf. A068608, A068609, A068610, A068611, A068613, A068614, A068615.
%K nonn
%O 0,2
%A Hans Secelle and Albrecht Heeffer (albrecht.heeffer(AT)pandora.be), Mar 09 2002
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