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A207998
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Number of nX2 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any knight-move neighbor (colorings ignoring permutations of colors).
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2
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2, 15, 114, 1657, 36401, 1094076, 42436913, 2042803419, 118645071202, 8138047375093, 648222594284197, 59148486677131940, 6113429673418115581, 708972517372901061559, 91508202542991877872978, 13053785934982985242672065
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OFFSET
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1,1
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LINKS
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EXAMPLE
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Some solutions for n=4
..0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0
..0..0....1..1....0..1....0..1....1..0....0..0....1..1....0..0....0..0....0..0
..1..1....1..1....1..1....1..1....1..1....1..1....1..1....1..1....1..2....1..1
..2..1....0..0....0..1....0..2....1..0....1..2....0..2....1..1....3..2....2..2
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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