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A183405
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Number of nX4 binary arrays with each sum of a(1..i,1..j) no greater than i*j/2
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1
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6, 78, 850, 12203, 154079, 2291035, 30897341, 467710777, 6547006490, 100186985054, 1436382214914, 22141316955632, 322776632209433, 5001593745014347, 73814087963795016, 1148305241863914557
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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 6X4
..0..0..1..0....0..1..0..0....0..0..1..0....0..1..0..0....0..0..0..0
..1..0..0..0....0..0..0..0....0..0..1..0....0..1..0..0....1..1..1..0
..0..0..1..0....0..1..1..0....1..1..0..0....0..0..0..0....0..0..1..0
..1..0..1..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
..0..0..0..0....0..1..1..0....0..1..1..0....1..0..1..0....0..0..0..0
..0..1..1..1....1..1..1..1....1..1..1..0....0..0..0..1....1..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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