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A224275
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Number of n X n 0..3 arrays with diagonals and rows unimodal and antidiagonals nondecreasing
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0
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4, 160, 13683, 1334973, 137489538, 14587480744, 1597855917875, 182011677068828, 21714188491890254, 2721720866571310952, 357937736330145145387
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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
..2..0..0....0..1..1....0..0..1....0..0..0....0..0..1....2..1..1....0..0..0
..2..2..1....2..2..2....3..2..2....0..1..1....3..3..1....3..2..1....0..0..1
..3..3..3....2..3..0....2..2..2....2..2..1....3..3..2....2..2..3....1..2..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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