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A203445
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Number of (n+1)X(n+1) 0..1 arrays with column and row pair sums b(i,j)=a(i,j)+a(i,j-1) and c(i,j)=a(i,j)+a(i-1,j) such that rows of b(i,j) and columns of c(i,j) are lexicographically nondecreasing
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0
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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..1..1....0..0..0..1..1....0..0..1..1..1....0..0..0..0..0
..0..0..1..1..1....0..0..0..1..1....0..0..1..1..1....0..0..0..1..1
..0..1..0..0..0....0..0..1..0..1....0..1..0..1..1....0..1..1..1..1
..1..0..1..1..1....0..1..0..1..1....0..1..1..1..1....1..1..1..0..0
..0..1..1..1..1....1..1..1..0..0....1..1..0..0..1....1..1..1..0..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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