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A224034
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Number of nX4 0..1 arrays with antidiagonals unimodal and rows and diagonals nondecreasing
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1
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5, 19, 58, 168, 488, 1422, 4160, 12214, 35960, 106072, 313246, 925694, 2736638, 8092056, 23930330, 70772252, 209309684, 619043562, 1830861726, 5414905178, 16014983408, 47365507554, 140087012360, 414317718488, 1225375238694
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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) = 5*a(n-1) -6*a(n-2) -a(n-3) +2*a(n-4) +2*a(n-5) -2*a(n-6) +4*a(n-7)
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EXAMPLE
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Some solutions for n=3
..1..1..1..1....0..0..1..1....0..0..0..0....0..0..0..1....0..0..0..0
..1..1..1..1....0..1..1..1....1..1..1..1....0..0..0..1....0..1..1..1
..0..1..1..1....0..1..1..1....1..1..1..1....0..0..0..0....0..0..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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