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A305583
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Number of nX5 0..1 arrays with every element unequal to 0, 1, 2, 7 or 8 king-move adjacent elements, with upper left element zero.
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1
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16, 8, 19, 38, 76, 327, 967, 2641, 8578, 26437, 78868, 243583, 747553, 2276209, 6972325, 21347977, 65257777, 199664890, 610944133, 1868823559, 5717250070, 17491334971, 53510023900, 163701580426, 500812768156, 1532124309511
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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) +3*a(n-2) +12*a(n-3) -9*a(n-5) -27*a(n-6) for n>10
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EXAMPLE
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Some solutions for n=5
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..1..1..1..1
..0..0..0..0..0. .0..0..1..1..0. .0..0..0..0..0. .1..0..1..1..1
..0..0..0..0..0. .0..0..0..0..0. .0..1..0..1..0. .1..1..1..1..1
..0..1..0..1..0. .0..0..0..0..0. .0..0..0..0..0. .1..0..1..1..1
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..1..1..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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