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A303724
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Number of nX5 0..1 arrays with every element unequal to 0, 1, 2 or 3 king-move adjacent elements, with upper left element zero.
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1
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16, 120, 77, 133, 219, 345, 564, 974, 1715, 2992, 5222, 9175, 16164, 28488, 50193, 88452, 155956, 275011, 484934, 855114, 1507919, 2659158, 4689360, 8269543, 14583134, 25717084, 45351643, 79976894, 141037974, 248718277, 438610954
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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) = 2*a(n-1) -a(n-4) -a(n-6) -a(n-7) +2*a(n-8) for n>12
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EXAMPLE
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Some solutions for n=5
..0..0..0..0..1. .0..1..1..1..1. .0..1..1..1..1. .0..0..0..1..0
..0..0..0..0..0. .0..1..1..1..1. .1..1..1..1..1. .0..0..1..1..1
..0..0..0..0..0. .0..1..1..1..1. .1..1..1..1..0. .0..1..1..1..1
..1..0..0..0..1. .0..1..1..1..1. .1..1..1..0..0. .1..1..1..1..1
..1..1..0..1..1. .0..1..1..1..1. .0..1..0..0..0. .0..1..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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