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A207204
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Number of nX4 0..2 arrays avoiding the pattern z-1 z-1 z in any row, column, nw-to-se diagonal or ne-to-sw antidiagonal
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1
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69, 4761, 192640, 7766709, 309262926, 12412097426, 500670359576, 20211739475415, 816401994553473, 32972023758335404, 1331635905868048301, 53778704755332004072, 2171870069814018679084, 87711499374615432079880
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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=5
..0..2..2..0....1..0..2..0....2..0..1..2....2..2..1..2....1..2..2..1
..0..1..0..1....1..0..0..0....0..2..1..0....2..2..1..0....2..0..1..1
..2..2..2..2....0..2..0..0....2..1..0..1....0..1..0..1....2..1..1..0
..1..2..2..2....2..0..0..0....0..2..1..2....0..2..0..0....1..0..0..2
..1..2..1..1....2..0..0..2....0..0..2..0....2..2..0..0....1..2..0..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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