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A283382
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Number of nX4 0..1 arrays with no 1 equal to more than two of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements.
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1
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0, 19, 532, 8087, 116624, 1592250, 20788531, 264040297, 3282238215, 40118887549, 483764807520, 5768246109027, 68131353675622, 798246637065836, 9287150583313283, 107389081231009891, 1235032262230121990
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OFFSET
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1,2
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COMMENTS
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LINKS
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FORMULA
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Empirical recurrence of order 57 (see link above)
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EXAMPLE
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Some solutions for n=4
..0..0..1..1. .1..0..1..1. .0..0..1..0. .0..1..1..1. .1..1..0..1
..0..1..0..1. .1..0..1..0. .1..1..1..1. .0..1..0..0. .0..0..0..1
..1..0..1..1. .1..1..0..1. .0..1..0..0. .1..0..1..1. .1..1..1..0
..1..0..0..1. .0..1..0..0. .0..0..0..0. .1..1..0..0. .0..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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