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A250684
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Number of (n+1)X(n+1) 0..3 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction
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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=3
..3..2..1..1....3..3..1..0....2..0..0..0....3..3..2..0....1..3..1..0
..2..1..0..0....3..3..1..0....2..0..0..0....3..3..2..2....1..3..2..1
..2..1..0..0....3..3..1..1....3..1..1..1....2..2..1..1....0..2..1..0
..1..2..3..3....2..2..0..2....2..3..3..3....1..3..3..3....0..2..1..3
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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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