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A298148
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Number of nX2 0..1 arrays with every element equal to 0, 1, 3, 4, 5 or 8 king-move adjacent elements, with upper left element zero.
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8
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2, 4, 4, 16, 50, 112, 348, 1028, 2796, 8216, 23816, 67776, 196296, 566512, 1628384, 4699280, 13549232, 39031840, 112541888, 324422976, 935034208, 2695453440, 7769839552, 22396226368, 64559126592, 186094935168, 536423458688
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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) +2*a(n-2) +6*a(n-3) -10*a(n-4) -8*a(n-5) for n>6
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EXAMPLE
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Some solutions for n=7
..0..0. .0..1. .0..1. .0..0. .0..0. .0..1. .0..0. .0..0. .0..0. .0..1
..1..1. .1..0. .0..1. .0..0. .0..0. .0..1. .0..0. .0..0. .0..0. .1..0
..1..1. .1..1. .0..0. .0..0. .0..1. .0..0. .1..1. .1..0. .0..0. .0..0
..1..1. .1..1. .1..0. .0..1. .1..0. .1..0. .1..1. .0..0. .1..1. .0..1
..0..0. .1..0. .0..0. .0..1. .1..1. .0..1. .1..1. .0..0. .0..0. .0..0
..1..1. .1..1. .1..0. .0..0. .1..0. .0..0. .1..0. .0..1. .0..0. .1..0
..0..0. .1..1. .1..0. .0..0. .0..1. .0..0. .1..0. .1..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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