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A251375
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Number of (n+1)X(2+1) 0..3 arrays with every 2X2 subblock summing to 5 6 or 7
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1
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1048, 19644, 385704, 7712232, 155378004, 3140670344, 63575161960, 1287767101980, 26092537560408, 528754534404104, 10715654829290772, 217167872708553784, 4401270254542866296, 89199630453126585356
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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) = 33*a(n-1) -258*a(n-2) -425*a(n-3) +9681*a(n-4) -20982*a(n-5) -28396*a(n-6) +102584*a(n-7) -55200*a(n-8) -23420*a(n-9) +17424*a(n-10) -528*a(n-11) -576*a(n-12)
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EXAMPLE
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Some solutions for n=2
..3..2..2....1..2..3....1..3..2....3..2..3....0..3..0....1..2..2....1..2..0
..2..0..2....1..2..0....3..0..1....1..0..2....1..1..2....1..2..0....1..2..1
..3..1..2....1..1..3....2..1..3....1..3..1....1..3..1....1..3..1....1..2..0
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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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