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A190606
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Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 0 1 diagonally, vertically or horizontally
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1
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39, 240, 2271, 35661, 836514, 27940563, 1374170474, 102369944843, 11464683896495, 1905358977494462, 469934471799881606, 172863979596481949179, 94947989820190085424440
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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..0..1..1....0..0..1..1....0..0..0..1....0..0..1..0....0..0..1..0
..0..0..1..1....0..1..1..1....0..0..1..0....0..0..1..0....0..0..1..1
..1..1..0..0....1..1..1..1....0..1..0..0....1..1..1..0....1..1..1..1
..1..1..0..0....1..1..1..0....1..0..0..1....0..0..0..1....0..1..1..0
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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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