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A206993
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Number of nX7 0..1 arrays avoiding 0 0 0 horizontally and 1 1 1 vertically
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1
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81, 6561, 80070, 2371090, 60684900, 1482397764, 37849652838, 954576893140, 24031904480250, 606711286710758, 15303296459686032, 385968153194641688, 9736392679516458222, 245594233526815556440, 6194918451958959626262
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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
..0..0..1..1..1..0..0....0..1..1..1..0..1..0....1..0..1..0..1..0..0
..1..0..0..1..1..0..1....1..0..0..1..1..1..0....1..1..0..0..1..1..1
..0..0..1..0..0..1..0....0..1..0..0..1..0..1....0..1..0..1..0..1..1
..1..1..0..0..1..1..0....0..0..1..1..0..1..0....0..0..1..1..1..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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