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A228753
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Number of nX7 binary arrays with top left element equal to 1 and no two ones adjacent horizontally or antidiagonally.
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1
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13, 289, 6277, 134440, 2876170, 61534448, 1316714732, 28177227352, 602998827928, 12904414518912, 276160275058160, 5909958226524512, 126475877308730464, 2706643227463513344, 57923438257867988416, 1239588830689830585216
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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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FORMULA
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Empirical: a(n) = 34*a(n-1) -324*a(n-2) +1264*a(n-3) -2236*a(n-4) +1816*a(n-5) -624*a(n-6) +64*a(n-7) for n>9
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EXAMPLE
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Some solutions for n=4
..1..0..1..0..0..0..0....1..0..0..1..0..0..1....1..0..1..0..0..0..0
..0..0..1..0..0..0..1....0..0..0..1..0..0..1....1..0..1..0..0..0..1
..0..0..0..1..0..0..1....0..0..0..0..1..0..1....0..0..0..1..0..0..1
..0..0..0..0..1..0..1....1..0..0..0..0..0..0....1..0..0..1..0..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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