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A202745
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Number of 4Xn 0..1 arrays with row sums equal and column sums unequal to adjacent columns
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0
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2, 10, 86, 838, 6870, 62398, 613950, 6018166, 59293518, 601267870, 6215708078, 64727555230, 679456522670, 7200537529326, 76879249259246, 825573117666246, 8913831877350462, 96733061472889806, 1054372579551732366
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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 n=5
..1..1..0..0..1....0..1..0..0..1....1..1..0..1..0....1..0..0..1..0
..0..1..0..1..1....0..1..0..0..1....1..1..0..0..1....1..1..0..0..0
..0..1..1..1..0....0..1..0..0..1....1..1..0..1..0....1..0..0..0..1
..1..1..0..1..0....0..0..0..1..1....1..0..0..1..1....1..0..0..1..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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