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A251029
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Number of (n+1)X(n+1) 0..3 arrays with nondecreasing min(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=2
..2..1..2....1..1..2....1..1..0....3..0..2....1..2..0....1..3..1....0..0..1
..2..1..3....1..1..2....1..1..1....3..0..3....1..3..2....1..2..2....1..1..3
..3..2..2....1..2..3....1..2..2....3..0..1....1..3..2....2..3..3....2..3..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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