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A227440
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Number of n X 4 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 5 binary array having two adjacent 1's and two adjacent 0's.
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1
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16, 240, 3346, 46126, 636996, 8802600, 121623396, 1680297950, 23214121178, 320714593384, 4430829128772, 61214050174352, 845701665042092, 11683776706885344, 161417013884667940, 2230053943181472702
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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=4
..1..1..1..1....1..0..0..0....1..1..0..1....1..1..0..1....1..0..0..0
..1..0..0..0....1..0..0..0....0..1..0..1....0..1..0..0....1..0..0..0
..0..1..1..1....0..1..0..0....0..0..0..1....1..0..0..1....0..1..1..0
..1..1..0..0....0..0..1..1....1..1..0..1....1..1..1..1....0..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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