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A212931
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Number of 2Xn 0..n-1 arrays with no column j greater than column j-1 in all rows
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1
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1, 15, 568, 39695, 4431876, 724082352, 163050236504, 48442719007503, 18368207542264060, 8659014569831436140, 4968837728849467193040, 3410836618457710864892912, 2760233360074280192888992948
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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=3
..0..1..2....0..0..1....2..1..0....0..0..0....2..1..2....0..2..1....0..2..0
..1..0..0....0..1..1....2..1..2....1..2..0....0..0..0....0..0..2....1..0..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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