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A254085
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Number of (n+2)X(1+2) 0..1 arrays with every 3X3 subblock diagonal maximum minus antidiagonal maximum nondecreasing horizontally, vertically and ne-to-sw antidiagonally
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1
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512, 3436, 22728, 148004, 977192, 6446656, 42580424, 281186200, 1857372144, 12268544428, 81040372600, 535313103052, 3536037360504, 23357456516908, 154288871288536, 1019162914084204, 6732132852099864, 44469447874930540
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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) = 6*a(n-1) +7*a(n-2) -18*a(n-3) +14*a(n-4) -156*a(n-5) -116*a(n-6) +72*a(n-7) +32*a(n-8) +96*a(n-9) +64*a(n-10) for n>17
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EXAMPLE
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Some solutions for n=4
..0..0..1....0..1..1....0..1..1....0..0..1....0..0..1....0..0..1....1..0..0
..1..0..1....0..0..0....0..0..0....0..1..0....1..0..1....1..0..0....1..1..1
..0..0..0....1..0..1....1..1..0....1..1..0....1..1..1....1..1..0....1..1..0
..1..0..1....0..0..0....1..0..1....1..0..0....0..0..0....0..1..0....1..1..0
..0..1..0....0..0..1....1..0..1....0..0..0....0..1..0....1..0..1....1..0..0
..1..0..1....1..0..1....1..0..1....0..0..0....0..0..1....0..0..0....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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