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A221228
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Number of nX4 arrays of occupancy after each element moves to some king-move neighbor, with no occupancy greater than 2
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0
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4, 1033, 65453, 4581973, 322610120, 23035350108, 1652940878370, 118885924289161, 8558151176825984, 616265885110474351, 44381234970536270542, 3196241880309292793297
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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
..1..1..0..0....2..0..1..2....2..0..0..0....1..0..1..1....1..1..1..2
..2..0..2..1....0..2..0..0....2..1..1..1....2..0..2..0....0..2..0..0
..2..2..1..0....2..1..2..0....2..1..0..2....0..2..2..1....1..0..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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STATUS
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approved
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