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A299888
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Number of n X 3 0..1 arrays with every element equal to 0, 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.
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1
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1, 13, 31, 156, 614, 2800, 13379, 63697, 313055, 1541446, 7631089, 37907371, 188460970, 938008699, 4670538813, 23261346000, 115871179617, 577226703607, 2875668407886, 14326569827639, 71375895052167, 355602303531952
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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) = 6*a(n-1) +2*a(n-2) -33*a(n-3) -40*a(n-4) +152*a(n-5) +18*a(n-6) -368*a(n-7) +310*a(n-8) +492*a(n-9) -362*a(n-10) -290*a(n-11) -8*a(n-12) -12*a(n-13) for n>15.
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EXAMPLE
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Some solutions for n=5
..0..0..0. .0..1..1. .0..0..0. .0..1..0. .0..0..0. .0..0..1. .0..0..0
..0..0..0. .1..1..1. .0..0..1. .0..0..0. .0..1..0. .0..0..0. .0..0..0
..0..0..1. .1..1..1. .0..1..1. .0..0..0. .0..1..1. .0..1..1. .1..1..1
..0..0..0. .1..1..0. .0..0..1. .1..0..0. .0..0..1. .0..1..1. .1..1..1
..0..0..0. .1..1..1. .1..0..0. .0..0..0. .0..1..1. .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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