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A183321
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Number of nX9 binary arrays with an element zero only if there are an even number of ones to its left and an even number of ones above it
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1
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89, 1097, 28959, 498825, 10288475, 190243099, 3674032121, 68795107993, 1301324910599, 24374459510955, 457521652409443, 8556633331945529, 160077250226203655, 2989991870865523923, 55846494235069318769
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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 5X9
..0..1..1..0..0..0..0..0..0....0..0..0..0..0..0..0..0..0
..0..1..1..0..0..0..0..0..0....0..0..0..0..0..0..0..0..0
..0..0..0..0..0..0..1..1..0....1..1..1..1..0..0..1..1..1
..0..0..0..0..1..1..1..1..1....1..1..1..1..0..0..1..1..1
..0..1..1..0..1..1..1..1..1....0..0..0..1..1..0..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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