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A190604
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Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 0 1 diagonally
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1
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56, 672, 14112, 522144, 33939360, 3869087040, 773817408000, 271609910208000, 167311704688128000, 180863952767866368000, 343098918400642500096000, 1142176299355738882819584000, 6672593940836226553432009728000
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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..1..0....1..0..1..0....0..1..1..0....1..1..1..1
..1..0..1..1....0..0..0..1....0..1..1..1....1..0..1..0....1..0..1..0
..1..1..0..1....1..0..1..1....1..1..1..0....1..1..1..0....1..1..0..1
..0..1..1..0....0..1..1..0....0..1..0..0....0..0..0..0....1..0..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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