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A221336
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Number of nX4 arrays of occupancy after each element stays put or moves to some king-move neighbor, with every occupancy equal to zero or two
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0
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4, 68, 790, 10704, 142792, 1937900, 26264018, 356533300, 4838763426, 65677043240, 891388869206
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=3
..2..0..2..0....2..0..0..2....0..2..2..2....2..0..0..0....0..2..0..2
..2..0..0..0....0..0..0..2....2..0..0..0....2..0..2..2....0..2..2..0
..2..2..2..0....2..0..2..2....2..0..2..0....2..2..0..0....2..0..2..0
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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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