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A303958
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Number of nX5 0..1 arrays with every element unequal to 0, 1, 2 or 5 king-move adjacent elements, with upper left element zero.
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1
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16, 22, 49, 159, 480, 1431, 4137, 12066, 35589, 104863, 307928, 904119, 2658091, 7815860, 22972429, 67514241, 198445406, 583320819, 1714573733, 5039601468, 14812938483, 43540143623, 127978525886, 376168992379, 1105679369815
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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) +11*a(n-4) -6*a(n-5) -23*a(n-6) +9*a(n-7) -8*a(n-8) +3*a(n-9) +13*a(n-10) -7*a(n-11) +2*a(n-12) +a(n-13) -a(n-14) +a(n-15) for n>21
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EXAMPLE
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Some solutions for n=5
..0..0..1..0..0. .0..0..1..0..0. .0..0..0..1..0. .0..0..0..1..0
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .1..0..0..0..0
..0..0..0..0..1. .1..0..0..0..0. .0..0..0..0..1. .0..0..0..0..0
..0..0..0..0..0. .0..0..0..0..0. .1..0..0..0..0. .1..0..0..0..0
..0..0..0..1..0. .0..1..0..0..0. .0..0..1..0..0. .0..0..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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