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A265914
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Number of Hamiltonian paths on an n X n grid reduced for symmetry, i.e., where rotations and reflections are not counted as distinct.
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3
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1, 1, 3, 38, 549, 28728, 1692417, 377919174, 93177169027, 91255604983167, 98333935794279062, 431583106977641773651, 2081500714709464758363648, 41476136050841717002906372881, 907951420995033325255530074961505
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OFFSET
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1,3
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COMMENTS
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For odd n > 1 the only symmetry possible is rotation by 180 degrees. For even n the only symmetries are reflections either horizontally or vertically. - Andrew Howroyd, Apr 15 2016
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LINKS
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CROSSREFS
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KEYWORD
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nonn,walk,hard
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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