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A187435
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Number of (n+1) X 4 0..2 arrays with no 2 X 2 subblock commuting with any of its horizontal and vertical 2 X 2 subblock neighbors.
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1
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5344, 311730, 18257013, 1070374436, 62735788524, 3677337022406, 215547981233289, 12634446300216814, 740573387875513027, 43409027745399571245, 2544438765507573177231, 149143369457644414336487
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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 3 X 4
..1..1..1..2....0..0..2..1....2..2..2..0....0..0..0..2....2..1..1..1
..0..1..1..1....0..1..0..2....0..2..1..0....0..2..2..0....0..0..1..0
..1..0..1..0....0..2..2..1....1..0..1..1....0..1..1..0....0..2..1..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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