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A283632
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Number of nX6 0..1 arrays with no 1 equal to more than one of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements.
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1
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5, 516, 21963, 700534, 19517898, 490925804, 11651389723, 264077146748, 5787991095939, 123521985310158, 2580501773367232, 52971731775396896, 1071564173210392627, 21408664196720380932, 423174810399432961803
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical recurrence of order 81 (see link above)
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EXAMPLE
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Some solutions for n=3
..0..1..0..0..0..1. .0..0..0..1..0..1. .0..0..0..1..0..1. .0..0..1..0..0..1
..1..0..0..1..0..1. .1..0..0..1..0..1. .0..0..0..0..0..1. .0..0..0..0..1..1
..1..1..0..0..0..0. .0..0..1..0..1..0. .0..0..1..1..1..1. .0..1..1..0..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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