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A190340
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Number of (n+1)X(n+1) symmetric binary matrices without the pattern 1 1 antidiagonally
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1
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4, 12, 72, 720, 10800, 259200, 10368000, 673920000, 70087680000, 11774730240000, 3214501355520000, 1420809599139840000, 1014458053785845760000, 1171699052122651852800000, 2191077227469358964736000000
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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 3X3
..1..0..1....0..0..1....0..0..1....0..0..0....1..0..0....1..0..1....0..0..0
..0..0..0....0..0..0....0..0..0....0..1..0....0..1..0....0..0..0....0..0..0
..1..0..0....1..0..1....1..0..0....0..0..1....0..0..0....1..0..1....0..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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