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A183412
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Number of nX5 binary arrays with each sum of a(1..i,1..j) no greater than i*j/2 and rows and columns in nondecreasing order
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1
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3, 21, 152, 1518, 11499, 98343, 556989, 3662106, 16124119, 85225430, 312644461, 1392323322, 4440186675, 17261781178, 49427257741, 171990299716, 450949023627, 1430808802178, 3490735786071, 10240050566337, 23490703637555
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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 4X5
..0..0..0..0..1....0..0..0..0..1....0..0..0..0..0....0..0..0..0..1
..0..0..1..1..0....0..0..1..1..1....0..0..1..1..1....0..0..0..0..1
..1..1..0..0..0....0..1..0..0..0....0..1..0..0..1....0..1..1..1..1
..1..1..1..1..0....1..1..1..1..0....0..1..0..1..1....1..0..0..0..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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