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A250710
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Number of (3+1)X(n+1) 0..3 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction
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1
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2435, 30719, 301632, 2492054, 18235293, 122690762, 774796977, 4673805813, 27196779938, 154066279127, 854122044467, 4658151131121, 25068017810185, 133534557525131, 705429509431519, 3702863919486346, 19335819140017317
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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 recurrence of order 65 (see link above)
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EXAMPLE
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Some solutions for n=2
..1..1..1....3..0..3....0..1..1....1..1..3....1..0..1....1..0..2....0..1..1
..0..2..2....0..3..2....0..2..1....0..2..2....0..2..2....0..1..2....0..1..1
..3..1..3....2..2..3....1..1..2....3..1..3....0..2..2....0..2..2....2..0..2
..1..3..1....1..3..2....3..2..1....1..3..2....0..3..2....3..3..3....0..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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