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A298570
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Number of n X 3 0..1 arrays with every element equal to 0, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero.
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1
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1, 4, 1, 2, 14, 10, 12, 72, 82, 90, 400, 600, 702, 2326, 4122, 5330, 14086, 27392, 39040, 88320, 179170, 277358, 568600, 1165362, 1925470, 3726194, 7580456, 13147134, 24677244, 49453854, 88749136, 164309028, 323901436, 594595204, 1096340090
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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) = 7*a(n-3) +2*a(n-4) +a(n-5) -10*a(n-6) -2*a(n-7) -2*a(n-8) +2*a(n-9).
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EXAMPLE
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Some solutions for n=5
..0..0..0. .0..1..0. .0..1..1. .0..1..0. .0..0..1. .0..1..0. .0..0..1
..0..1..0. .0..0..0. .0..0..1. .0..0..0. .0..1..1. .0..0..0. .0..1..1
..0..0..0. .1..1..1. .1..1..1. .0..0..0. .0..0..0. .0..0..0. .0..0..0
..0..0..0. .1..0..1. .1..0..0. .1..0..0. .0..0..1. .0..0..1. .1..1..0
..0..1..0. .1..1..1. .1..1..0. .1..1..0. .0..1..1. .0..1..1. .1..0..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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