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A305036
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Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 6 or 7 king-move adjacent elements, with upper left element zero.
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1
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8, 5, 7, 19, 26, 61, 143, 277, 568, 1244, 2600, 5369, 11341, 23905, 49970, 104796, 220286, 462165, 969275, 2034517, 4270128, 8959604, 18801136, 39456489, 82798877, 173748993, 364613994, 765145940, 1605646822, 3369435285, 7070757515
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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) +5*a(n-3) +a(n-4) -4*a(n-6) -4*a(n-7) for n>11
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EXAMPLE
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Some solutions for n=5
..0..0..0..0. .0..0..0..0. .0..1..1..1. .0..0..0..0. .0..0..0..1
..0..0..1..0. .0..0..0..0. .1..0..1..1. .0..1..1..0. .0..0..1..0
..0..0..1..0. .0..1..1..0. .1..1..0..1. .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..0
..0..0..0..0. .0..0..0..0. .1..1..1..1. .0..0..0..0. .0..0..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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