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A283686
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Number of nX3 0..1 arrays with no 1 equal to more than two of its horizontal, diagonal and antidiagonal neighbors.
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1
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8, 49, 264, 1525, 8732, 49924, 285770, 1635402, 9359104, 53561285, 306524651, 1754204129, 10039103443, 57452599764, 328794429339, 1881651609689, 10768469471919, 61626676386770, 352682175698390, 2018358353003843
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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: a(n) = 5*a(n-1) +2*a(n-2) +14*a(n-3) -9*a(n-4) +2*a(n-5) -45*a(n-6) -20*a(n-7) -6*a(n-8) +24*a(n-9) +40*a(n-10)
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EXAMPLE
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Some solutions for n=4
..0..0..0. .1..0..0. .0..0..1. .0..0..1. .0..0..0. .1..0..1. .1..1..0
..0..0..0. .0..0..0. .0..1..0. .0..0..1. .1..0..0. .0..1..0. .0..1..1
..1..1..0. .1..0..0. .0..0..1. .1..0..0. .0..0..0. .0..1..0. .0..0..0
..0..0..1. .0..1..0. .1..0..0. .0..0..0. .0..1..1. .0..0..0. .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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