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A190607
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Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 0 1 diagonally, vertically, antidiagonally or horizontally
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0
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34, 168, 1135, 12814, 224705, 5127157, 154820497, 6857389175, 450847078335, 41610167180266, 5282145722452860, 946058243422221058, 244167133066656271715, 89943772503552797451562
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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..0..0....1..0..0..0....1..0..0..0....0..0..1..0....0..0..1..0
..0..0..1..0....0..0..0..0....0..1..1..0....0..1..1..0....0..1..1..1
..0..1..0..0....0..0..0..1....0..1..1..1....1..1..1..0....1..1..1..1
..0..0..0..0....0..0..1..1....0..0..1..0....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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