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A175855
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The number of closed Knight's tours on a 5 X 2n board.
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1
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0, 0, 8, 44202, 13311268, 4557702762, 1495135512514, 491857035772330, 161514101568508400, 53034853662012222798, 17414154188157170439208, 5717847862749642677204182, 1877435447920358266870897874, 616447390029326136628439042672, 202407848349722353779265745190616, 66459727085467788423206394162537418, 21821760546806761707309514948565417796, 7165079447164571822068029945303172129766, 2352622444655438705806553391345493395131580, 772473271844923268504474277422663237674924998
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OFFSET
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1,3
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LINKS
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EXAMPLE
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The smallest 5 X 2n board admitting a closed Knight's tour is the 5 X 6, on which there are 8 such tours.
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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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