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A169777
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Number of geometrically distinct open knight's tours of a 3 X n chessboard.
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16
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3, 0, 0, 14, 104, 146, 773, 2698, 14350, 32296, 161714, 460022, 2159794, 5851548, 26468357, 76442996, 330719293, 965759972, 4056479056, 12186078360, 49668414086, 151760518296, 604396415979, 1879966906486, 7330203447133, 23126786408904, 88609897281582
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listen;
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OFFSET
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4,1
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REFERENCES
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D. E. Knuth, Long and skinny knight's tours, in Selected Papers on Fun and Games, to appear, 2010.
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LINKS
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FORMULA
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EXAMPLE
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The three distinct 3x4 tours were published by Euler in Memoires Acad. Roy. Sci. (Berlin, 1759), 310-337.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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