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A208711
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Number of 4Xn 0..1 arrays with new values 0..1 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors
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1
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8, 128, 1372, 16084, 185344, 2142580, 24754628, 286034292, 3305009328, 38188137788, 441249345280, 5098468022268, 58910854227068, 680692462409636, 7865141904908344, 90878716312611076, 1050068921631026592
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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) +31*a(n-2) -11*a(n-3) -71*a(n-4) -a(n-5) +38*a(n-6) -8*a(n-7) for n>9
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EXAMPLE
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Some solutions for n=4
..0..1..0..1....0..1..0..1....0..1..1..0....0..0..0..1....0..0..0..1
..1..0..1..1....1..1..0..1....0..0..1..0....1..0..1..1....1..0..0..0
..0..0..0..1....0..1..1..0....0..0..1..1....0..0..1..0....1..1..1..1
..0..1..0..1....0..0..1..1....1..0..0..0....0..1..0..0....1..0..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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