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A221135
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Number of nX4 arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2
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1
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4, 289, 12544, 643204, 31203396, 1539699121, 75512292025, 3709710975721, 182118668668225, 8941989810789025, 439009303948483984, 21553427021714858449, 1058163003670012270144, 51950295646215686851681
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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..2..2..1....2..1..1..1....1..2..2..0....0..1..2..0....2..2..1..0
..1..0..1..1....2..1..0..1....1..0..1..2....2..2..1..0....0..1..1..1
..1..0..0..1....0..2..1..0....1..1..0..1....0..1..2..1....1..2..0..1
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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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