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A207985
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Number of nX4 0..2 arrays avoiding the pattern z z+1 z horizontally and z z-1 z vertically
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1
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69, 4761, 244325, 12271227, 622569385, 31638012071, 1607243845009, 81641053794111, 4147075467417469, 210658289444343157, 10700760566367351027, 543563676726218129663, 27611262828599058482901, 1402562262828848350945747
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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=4
..0..2..2..2....0..2..0..0....0..2..0..1....2..0..0..0....2..2..1..2
..1..1..0..2....0..1..2..0....2..0..1..1....0..1..1..0....2..1..0..0
..2..0..1..1....1..0..2..0....0..2..1..1....0..1..1..2....1..1..2..0
..1..2..0..0....0..2..1..2....2..0..0..1....2..2..0..1....0..1..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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