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A203107
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Number of n X 7 binary arrays with every 1 immediately preceded by 0 0 to the left or above.
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1
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9, 81, 4314, 130886, 3058275, 86512536, 2482513429, 67503863246, 1856382696349, 51633511183958, 1427030810399597, 39387690638977285, 1089488148528198780, 30128638070023208442, 832728521178275562686, 23020941223065491588705
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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
..0..0..0..1..0..0..0....0..0..0..1..0..0..0....0..0..0..0..0..0..1
..0..0..0..1..0..0..1....0..0..0..1..0..0..1....0..0..1..0..0..0..0
..0..0..1..0..1..1..0....1..0..1..0..0..0..1....1..1..0..1..1..0..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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