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A234156
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Number of (n+1)X(3+1) 0..3 arrays with every 2X2 subblock having the absolute values of all six edge and diagonal differences no larger than 1
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1
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1108, 21428, 411712, 7952532, 153793284, 2976757624, 57647946980, 1116833738020, 21642612331360, 419482808622564, 8131644594825316, 157646909459448984, 3056492082359701508, 59262933197614888180
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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) = 38*a(n-1) -412*a(n-2) +740*a(n-3) +5548*a(n-4) -11466*a(n-5) -28213*a(n-6) +27544*a(n-7) +43860*a(n-8) -11608*a(n-9) -8172*a(n-10) +1584*a(n-11)
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EXAMPLE
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Some solutions for n=2
..1..1..2..1....1..1..0..0....1..1..2..2....1..0..0..1....0..0..1..2
..2..2..2..2....1..0..0..1....1..1..1..2....1..1..1..0....1..1..1..1
..2..3..2..2....0..0..0..1....1..1..1..2....2..1..0..0....1..1..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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