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A207425
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Number of nX7 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 0 vertically
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1
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40, 1600, 20550, 241087, 3210938, 39698733, 474552171, 5755114104, 69609375870, 836438494500, 10061632597765, 121113950382680, 1456404024212421, 17511407393280395, 210603058946646014, 2532582001420108242
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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
..1..1..0..1..1..0..0....0..1..1..1..1..0..1....1..1..0..1..1..0..1
..0..1..1..0..0..1..1....1..1..1..1..1..1..1....1..0..1..1..1..0..1
..0..0..1..1..1..1..1....1..1..1..1..1..1..1....0..0..1..1..0..0..1
..0..1..1..1..1..0..1....1..1..1..1..1..1..0....0..0..1..1..1..0..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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