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A188417
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Number of (2*n)Xn binary arrays with rows in nonincreasing order, 2 ones in every column and no more than 3 ones in any row
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0
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1, 3, 16, 124, 1308, 17443, 282349, 5396178, 119324602, 3005520274, 85152637884, 2685936442822, 93514176139534
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internal format)
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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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All solutions for 4X2
..1..1....1..1....1..0
..1..0....1..1....1..0
..0..1....0..0....0..1
..0..0....0..0....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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