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A190419
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Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 1 1 diagonally
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1
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56, 728, 17472, 768768, 62270208, 9278260992, 2542243511808, 1281290729951232, 1187756506664792064, 2025124843863470469120, 6350791510355843391160320, 36631365431732504680212725760, 388622155865250142152376807587840
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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 n=2
..1..0..1..0....1..1..1..0....1..1..0..1....0..1..1..0....1..0..0..1
..0..0..0..0....1..1..0..1....1..0..0..0....1..1..0..0....0..1..0..1
..1..0..0..1....1..0..0..1....0..0..0..1....1..0..0..0....0..0..0..1
..0..0..1..0....0..1..1..0....1..0..1..0....0..0..0..1....1..1..1..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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