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A183769
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1/32 the number of (n+1) X 7 binary arrays with equal numbers of 2 X 2 subblocks with sum mod two being 0 and 1.
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1
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160, 14784, 1555840, 173065984, 19855042560, 2323234636800, 275588031713280, 33021546171494400, 3987331943727333376, 484411726089672392704, 59141557731461248942080, 7250125459895693790478336
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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 3 X 7:
..0..0..0..1..0..0..1....0..0..0..0..0..1..0....0..0..0..0..1..1..0
..0..1..1..0..0..1..1....0..0..1..0..0..0..1....1..1..0..1..1..0..1
..0..0..0..1..1..1..1....1..0..1..1..0..0..1....1..1..0..0..0..1..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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