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A250748
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Number of (n+1)X(n+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)+x(i-1,j) in the j direction
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1
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32, 237, 1353, 6663, 29814, 124785, 497471, 1911819, 7141428, 26081157, 93524517, 330341391, 1152105314, 3974940633, 13587035451, 46067386899, 155081690112, 518770438893, 1725559820033, 5710472045463, 18811007467662, 61706609086017
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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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EXAMPLE
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Some solutions for n=4
..0..0..0..0..0....2..2..2..2..2....1..1..0..0..0....2..2..2..2..2
..0..0..0..0..0....2..2..2..2..2....0..0..1..1..1....0..0..0..0..0
..1..1..2..2..2....2..2..2..2..2....0..0..1..1..1....0..0..1..1..1
..0..0..2..2..2....1..1..1..1..1....0..0..1..1..1....0..0..2..2..2
..0..0..2..2..2....0..0..2..2..2....1..1..2..2..2....0..0..2..2..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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