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A254423
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Number of (2+1)X(n+1) 0..2 arrays with every 2X2 subblock diagonal maximum minus antidiagonal maximum nondecreasing horizontally, vertically and ne-to-sw antidiagonally
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1
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470, 3279, 25589, 229652, 2128339, 19879926, 186426904, 1752614398, 16501742450, 155519360130, 1466527601250, 13834051837650, 130527440933858, 1231716994177714, 11623968878478050, 109703076280582962
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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) = 21*a(n-1) -139*a(n-2) +191*a(n-3) +1344*a(n-4) -4896*a(n-5) +1972*a(n-6) +10548*a(n-7) -8240*a(n-8) -8576*a(n-9) +4704*a(n-10) +3072*a(n-11) for n>18
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EXAMPLE
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Some solutions for n=3
..0..0..1..2....0..1..2..1....2..2..2..0....0..1..2..0....1..2..1..2
..1..1..1..2....0..0..2..0....2..2..2..2....0..1..2..0....2..2..2..2
..0..0..1..2....0..0..2..2....2..2..2..1....2..2..2..1....2..0..1..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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