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A208550
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Number of n X n 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 0 1 1 vertically.
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1
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2, 16, 90, 1089, 10080, 150544, 1913940, 33930625, 544003170, 11177987076, 215177010048, 5033386477441, 112708053008152, 2958949185458176, 75387859827570360, 2195709810260687361, 62623865365172370000
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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..0..1..0....0..1..1..0....0..1..1..1....0..1..0..0....1..0..1..1
..0..1..1..1....0..1..1..0....0..1..0..1....1..0..1..1....0..1..1..0
..1..0..1..0....0..1..0..0....0..1..1..0....0..1..0..0....1..0..1..1
..0..1..0..1....0..1..1..0....0..1..0..0....1..0..1..1....0..1..1..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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