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A190601
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Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 0 1 antidiagonally
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1
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48, 576, 11520, 403200, 25401600, 2743372800, 526727577600, 176980466073600, 104064514051276800, 107810836557122764800, 195461046678063572582400, 622543433669632478674944000, 3480017794213245555792936960000
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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..0..1....1..0..0..1....0..1..0..1....1..1..1..0....1..1..0..0
..1..0..1..1....0..0..0..0....1..1..1..1....1..1..0..0....1..0..1..0
..0..1..1..1....0..0..0..0....0..1..1..1....1..0..1..0....0..1..1..0
..1..1..1..1....1..0..0..0....1..1..1..0....0..0..0..1....0..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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