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A190534
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Number of (n+2)X(n+2) symmetric binary matrices without the pattern 0 1 1 vertically, antidiagonally or horizontally
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1
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42, 282, 2156, 22640, 316238, 6107152, 160575506, 5870861789, 297355717075, 20939485177609, 2053441860491509, 280623087234506165, 53465534329788380473, 14206838360639441172569, 5266500605033810191697624
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OFFSET
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1,1
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LINKS
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EXAMPLE
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Some solutions for 4X4
..0..0..0..0....1..0..0..1....1..1..1..1....0..1..0..0....0..1..0..1
..0..1..0..1....0..0..0..1....1..1..1..0....1..0..0..0....1..0..0..0
..0..0..1..0....0..0..1..0....1..1..0..0....0..0..0..1....0..0..0..0
..0..1..0..1....1..1..0..0....1..0..0..1....0..0..1..0....1..0..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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