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A183249
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Half the number of n X 3 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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1, 6, 25, 164, 1092, 7954, 57519, 429936, 3205504, 24288784, 184062519, 1407419548, 10773952376, 82925706270, 639182387805, 4944237734904, 38299501221912, 297409232997320, 2312508964364352, 18013343447396448, 140477702503827052
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OFFSET
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1,2
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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 3 X 3
..0..1..1....0..1..1....0..0..0....0..1..0....0..1..0....0..0..1....0..1..0
..0..1..0....0..0..1....1..1..1....0..1..0....0..1..1....0..0..1....1..1..0
..0..1..0....1..0..1....0..0..1....0..1..1....0..0..1....1..1..1....1..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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