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A190605
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Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 0 1 diagonally or antidiagonally
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1
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44, 392, 5328, 119883, 4524432, 264917871, 24691633610, 3695710760736, 889996573057683, 344208553873787552, 212232817711368447264, 209378526541030232270145, 331234853208637544240698701
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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..1..1..0....1..0..0..1....0..1..0..1....0..0..0..1....0..0..1..0
..1..1..1..1....0..1..0..0....1..0..1..1....0..0..1..0....0..1..0..1
..1..1..1..0....0..0..1..0....0..1..1..1....0..1..1..1....1..0..1..0
..0..1..0..0....1..0..0..1....1..1..1..1....1..0..1..0....0..1..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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