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A202547
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Number of nX6 nonnegative integer arrays each row and column an ascent sequence (interior element no greater than one plus up-steps preceding it)
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1
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1, 32, 2094, 219934, 31670778, 5534917394, 1078490778110, 222425177005132, 47166084815234578, 10132160238913275232, 2189244152545815718298, 474218997901396743953114, 102831073878890605814623386
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OFFSET
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1,2
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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..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0
..0..0..1..0..1..1....0..0..1..1..1..1....0..0..1..0..0..1....0..0..1..0..0..0
..0..1..1..1..0..2....0..1..1..2..2..1....0..0..1..0..1..2....0..0..0..1..1..1
..0..1..0..0..1..1....0..0..0..1..0..0....0..0..1..0..2..0....0..0..1..0..2..0
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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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