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A183250
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Half the number of nX4 binary arrays with the number of 1-1 adjacencies equal to the number of 0-0 adjacencies
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1
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2, 18, 164, 2101, 29100, 417190, 6104168, 90554742, 1356933444, 20489622108, 311268434796, 4751843588209, 72836045462648, 1120231330154058, 17279391496374040, 267199601139845596, 4140858845912841972
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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 with a(1,1)=0 for 3X4
..0..1..1..0....0..1..1..0....0..0..1..0....0..0..0..0....0..0..1..0
..0..1..1..0....0..0..0..1....1..1..1..0....1..1..0..0....1..1..0..0
..0..1..0..0....1..1..1..0....0..0..1..0....1..1..1..1....1..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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