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A237634
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Number of (n+1)X(5+1) 0..2 arrays with the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one
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1
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4621, 4500, 2086, 2816, 4622, 5656, 7756, 11312, 17626, 22624, 30496, 45248, 70792, 90496, 121984, 180992, 283168, 361984, 487936, 723968, 1132672, 1447936, 1951744, 2895872, 4530688, 5791744, 7806976, 11583488, 18122752, 23166976, 31227904
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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) = 4*a(n-4) for n>13
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EXAMPLE
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Some solutions for n=5
..0..0..2..0..0..0....2..1..0..0..0..2....0..0..0..0..2..2....0..0..0..2..0..0
..1..2..1..0..1..2....2..1..0..1..2..0....0..2..1..0..1..2....0..1..2..1..0..1
..2..0..0..0..2..1....0..0..0..2..1..0....0..1..2..0..0..0....1..2..0..0..0..2
..1..0..1..2..0..0....0..1..2..0..0..0....0..0..0..2..1..0....2..1..0..1..2..1
..0..0..2..0..1..0....1..2..1..0..1..2....2..1..0..1..2..1....0..0..0..2..0..0
..1..2..1..0..0..2....2..0..0..0..2..2....2..2..0..0..0..2....0..1..2..1..0..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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