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A303678
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Number of nX4 0..1 arrays with every element unequal to 0, 1 or 3 king-move adjacent elements, with upper left element zero.
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1
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5, 17, 15, 28, 44, 64, 90, 132, 204, 312, 466, 688, 1024, 1540, 2318, 3472, 5184, 7748, 11606, 17396, 26052, 38984, 58338, 87340, 130788, 195824, 293146, 438824, 656952, 983564, 1472534, 2204504, 3300280, 4940796, 7396894, 11073932, 16578716
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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) = a(n-1) +a(n-4) +a(n-5) for n>8
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EXAMPLE
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Some solutions for n=5
..0..0..0..1. .0..0..0..0. .0..1..1..1. .0..1..1..1. .0..1..1..1
..0..0..0..0. .0..0..0..0. .0..0..1..1. .1..1..1..1. .1..1..1..1
..1..0..0..0. .0..0..0..1. .0..0..0..1. .1..1..1..1. .1..1..1..1
..1..1..0..0. .0..0..1..1. .0..0..0..0. .1..1..1..1. .0..1..1..1
..1..1..1..0. .0..1..1..1. .1..0..0..0. .0..1..1..0. .0..0..1..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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