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A283859
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Number of 3Xn 0..1 arrays with no 1 equal to more than three of its horizontal, diagonal and antidiagonal neighbors.
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1
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8, 64, 409, 2776, 19220, 131617, 901397, 6182652, 42392411, 290633973, 1992674389, 13662396421, 93672704694, 642244067806, 4403393953741, 30190811094903, 206996026936933, 1419218513242242, 9730530558373154, 66715043135972866
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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) +5*a(n-2) +50*a(n-3) +21*a(n-4) +11*a(n-5) -67*a(n-6) -229*a(n-7) -116*a(n-8) +41*a(n-9) +116*a(n-10) +66*a(n-11) +15*a(n-12) +a(n-13) -2*a(n-14)
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EXAMPLE
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Some solutions for n=4
..0..1..0..1. .0..1..1..0. .0..1..0..0. .1..0..1..1. .1..0..1..1
..1..0..1..1. .0..0..0..0. .0..1..0..1. .0..0..1..1. .0..1..0..1
..1..0..0..0. .0..0..1..1. .0..0..1..1. .1..1..1..0. .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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