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A206953
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Number of nX4 0..2 arrays avoiding the pattern z z+1 z in any row, column or nw-to-se diagonal
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1
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69, 4761, 218637, 9803278, 449797912, 20694430627, 950821989599, 43676385937074, 2006497292305518, 92180116069921220, 4234783426805045787, 194547099770290413016, 8937559013725835053331, 410594472108308448412855
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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..0..1....0..2..2..2....2..0..0..1....0..2..0..0....2..1..2..2
..2..0..1..1....1..1..0..2....1..1..0..1....0..1..2..0....2..2..1..2
..0..2..1..1....2..0..1..1....2..2..1..0....1..2..2..0....0..2..2..2
..2..0..0..1....2..2..1..2....2..2..2..0....1..2..2..2....0..0..2..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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