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A283489
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Number of nX3 0..1 arrays with no 1 equal to more than three of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly one element.
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1
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0, 2, 59, 576, 5444, 47712, 402588, 3304736, 26585976, 210604104, 1648084920, 12770161232, 98143291572, 749097112304, 5684201101568, 42914522732568, 322570735588252, 2415252852914064, 18022243345734636, 134067764826183784
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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: a(n) = 10*a(n-1) +a(n-2) -110*a(n-3) -267*a(n-4) -266*a(n-5) -146*a(n-6) -72*a(n-7) -41*a(n-8) -4*a(n-9) -4*a(n-10) for n>13
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EXAMPLE
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Some solutions for n=4
..1..0..1. .0..0..0. .0..1..1. .0..1..0. .1..0..1. .1..1..1. .1..1..1
..1..0..1. .1..0..1. .0..1..1. .1..0..1. .1..1..1. .0..1..0. .0..1..1
..1..1..1. .1..1..1. .1..1..0. .1..1..1. .1..0..0. .1..1..0. .0..1..0
..1..1..0. .1..0..0. .0..0..0. .0..1..0. .1..0..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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