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A184557
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Number of (n+1)X3 0..2 arrays with no 2X2 subblock summing to less than 4
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1
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336, 5736, 91157, 1486258, 24057629, 390354307, 6329171799, 102644935902, 1664547601646, 26993866274311, 437754652218346, 7099004652318411, 115123459690848087, 1866939760799593583, 30275877954690891176
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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)=15*a(n-1)+43*a(n-2)-381*a(n-3)-42*a(n-4)+1696*a(n-5)-590*a(n-6)-2216*a(n-7)+1085*a(n-8)+858*a(n-9)-456*a(n-10)-88*a(n-11)+48*a(n-12)
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EXAMPLE
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Some solutions for 5X3
..0..0..1....0..0..2....0..1..0....0..0..0....0..1..1....0..1..1....0..0..2
..2..2..1....2..2..0....2..2..1....2..2..2....2..2..2....2..2..0....2..2..2
..1..1..2....0..2..0....2..0..2....2..1..1....0..2..0....0..2..0....1..1..1
..1..1..1....1..2..2....1..1..1....0..2..1....2..1..2....1..2..1....2..2..2
..1..2..2....1..2..0....2..0..2....2..2..1....2..1..0....2..1..0....2..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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