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A237301
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Number of (n+1)X(1+1) 0..2 arrays with the upper median of every 2X2 subblock equal
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1
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81, 435, 2174, 11545, 61055, 326262, 1745153, 9357963, 50227854, 269885945, 1451322519, 7810753350, 42066630913, 226720598435, 1222759174366, 6599028303897, 35636883752111, 192571672161174, 1041238183574337
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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) = 9*a(n-1) -143*a(n-3) +79*a(n-4) +796*a(n-5) -292*a(n-6) -1760*a(n-7) +256*a(n-8) +1280*a(n-9)
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EXAMPLE
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Some solutions for n=5
..2..0....2..2....2..0....2..0....2..1....0..1....1..2....1..0....2..1....1..2
..2..1....2..0....2..1....1..0....2..1....2..0....1..1....1..1....0..1....0..0
..2..0....2..1....2..1....2..0....1..2....1..0....1..0....1..2....1..2....1..1
..2..1....2..0....2..1....0..1....2..1....1..2....2..1....0..0....0..1....2..0
..2..1....2..2....2..2....0..1....2..1....0..1....1..0....1..2....1..0....0..1
..2..2....1..0....0..2....2..1....0..2....1..1....1..1....1..0....2..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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