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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, 41, 68, 37, 62, 33, 58, 55, 28, 51, 80, 47, 76, 43, 70, 39, 66, 63, 34, 59, 56, 29, 52, 49, 78, 45, 74, 71, 40, 67, 64, 35, 60, 31, 54
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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COMMENTS
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One of eight possible knight's tours. Squares are numbered in a clockwise spiral. Enumerates all positive integers.
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LINKS
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Hugo Pfoertner, Table of n, a(n) for n = 0..1088 [Offset adapted by Georg Fischer, Jun 04 2019]
Frank Ellermann, Sequences based on a spiral of the natural numbers
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CROSSREFS
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Cf. A068608, A068609, A068610, A068611, A068613, A068614, A068615.
Sequence in context: A040386 A309321 A104158 * A233820 A040387 A201137
Adjacent sequences: A068609 A068610 A068611 * A068613 A068614 A068615
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KEYWORD
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nonn
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AUTHOR
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Hans Secelle and Albrecht Heeffer (albrecht.heeffer(AT)pandora.be), Mar 09 2002
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STATUS
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approved
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