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A190537
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Number of (n+2)X(n+2) symmetric binary matrices without the pattern 0 1 1 diagonally, vertically or horizontally
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1
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39, 276, 2462, 30347, 497319, 11215564, 345643238, 14729798587, 868126086355, 71051142699591, 8082717906091557, 1279982834102896086, 282345340720841681874, 86807291886729731363231
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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
..1..1..1..0....0..0..0..1....1..1..0..0....0..1..0..1....1..0..0..1
..1..0..1..0....0..1..0..1....1..1..1..0....1..1..1..1....0..0..0..1
..1..1..0..0....0..0..0..0....0..1..0..1....0..1..0..0....0..0..0..0
..0..0..0..0....1..1..0..0....0..0..1..0....1..1..0..0....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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