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A237010
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Number of (n+1)X(3+1) 0..3 arrays with the sum of all four elements of every 2X2 subblock equal
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1
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1936, 3928, 8416, 20776, 53200, 149608, 431584, 1327432, 4162576, 13679848, 45649696, 157880776, 552602320, 1988104168, 7216941664, 26751072712, 99788476816, 378092200168, 1438665935776, 5537532152776, 21372521423440
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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) = 8*a(n-1) +16*a(n-2) -268*a(n-3) +189*a(n-4) +3388*a(n-5) -5824*a(n-6) -20048*a(n-7) +49756*a(n-8) +52752*a(n-9) -196896*a(n-10) -24192*a(n-11) +369216*a(n-12) -131328*a(n-13) -262656*a(n-14) +165888*a(n-15)
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EXAMPLE
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Some solutions for n=5
..2..1..2..1....2..2..2..1....2..1..3..2....3..0..3..0....2..0..2..0
..1..2..1..2....3..2..3..3....1..3..0..2....3..1..3..1....0..3..0..3
..0..3..0..3....1..3..1..2....1..2..2..3....2..1..2..1....1..1..1..1
..3..0..3..0....3..2..3..3....3..1..2..0....1..3..1..3....2..1..2..1
..0..3..0..3....1..3..1..2....2..1..3..2....0..3..0..3....1..1..1..1
..3..0..3..0....3..2..3..3....2..2..1..1....1..3..1..3....1..2..1..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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