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A169770
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Number of open knight's tour diagrams of a 3 X n chessboard that have "type X": both endpoints occur in the same column.
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9
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4, 0, 0, 0, 80, 40, 368, 352, 5296, 3744, 48656, 40208, 523808, 415488, 5270976, 4333504, 54215264, 44497728, 551297184, 458337984, 5613555008, 4691821600, 56981627840, 47988689152, 577641089664, 489273948160, 5845628996352
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listen;
history;
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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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Asymptotic value 0.000169*n*3.11949^n when n is even, 0.0000526*n*3.11949^n when n is odd.
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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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