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A190416
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Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 1 1 antidiagonally
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1
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48, 432, 7776, 279936, 18475776, 2235568896, 491825157120, 196730062848000, 145580246507520000, 199299357468794880000, 501437183391487918080000, 2318645536002240133201920000, 19708487056019041132216320000000
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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
..0..1..1..1....1..1..0..0....0..0..0..0....1..1..1..0....1..1..0..1
..1..0..0..0....1..0..1..1....0..0..0..0....1..0..1..0....1..0..0..1
..1..0..0..0....0..1..0..0....0..0..0..0....1..1..0..1....0..0..0..0
..1..0..0..0....0..1..0..0....0..0..0..0....0..0..1..1....1..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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