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A275406
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Number of 7Xn 0..2 arrays with no element equal to any value at offset (-2,-1) (-2,0) or (-1,1) and new values introduced in order 0..2.
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1
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48, 260, 2645, 27373, 283169, 2940064, 30551417, 317215507, 3295389070, 34229946538, 355557100121, 3693307572143, 38363725298482, 398498904233689, 4139351037446210, 42997002237357820, 446625826073952314
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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) +51*a(n-2) +337*a(n-3) +695*a(n-4) -1387*a(n-5) -17115*a(n-6) -7374*a(n-7) -6423*a(n-8) +162272*a(n-9) -77464*a(n-10) +195500*a(n-11) -502027*a(n-12) +476993*a(n-13) -89619*a(n-14) +690641*a(n-15) -729684*a(n-16) +108400*a(n-17) -61140*a(n-18) +17920*a(n-19) +2032*a(n-20) +1088*a(n-21) for n>22
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EXAMPLE
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Some solutions for n=4
..0..0..0..0. .0..0..1..1. .0..0..1..1. .0..1..2..0. .0..0..1..1
..1..2..2..2. .2..2..0..0. .1..2..2..0. .0..0..1..2. .2..0..0..1
..1..1..1..2. .1..2..2..2. .1..1..2..0. .2..2..0..1. .2..1..2..2
..2..0..0..1. .0..1..1..1. .0..0..1..1. .1..1..2..0. .0..1..1..2
..2..2..0..0. .2..0..0..1. .2..2..0..1. .0..1..1..2. .0..0..0..1
..1..1..1..2. .1..2..2..0. .1..1..2..0. .2..2..0..1. .2..2..0..0
..0..0..1..2. .1..1..2..2. .0..1..1..2. .1..2..0..0. .1..2..2..2
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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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