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A207420
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Number of n X n 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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0
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2, 16, 114, 1521, 55361, 3892729, 474552171, 116947584576, 59951676534906, 60921409199181129, 121441530119384020545, 483128923550195512221129, 3857404253001354057074186601, 61418617253685924322130029824769
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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..1....1..1..1..0....1..0..0..1....0..0..1..1....0..1..1..0
..0..0..1..1....0..0..1..1....1..0..1..1....1..1..1..0....1..0..1..1
..1..0..1..1....0..1..1..1....0..0..1..1....1..1..0..0....1..0..0..1
..1..0..0..1....0..1..1..1....1..0..0..1....1..1..1..0....0..0..1..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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