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A163725
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Number of nX4 binary arrays with all 1s connected, a path of 1s from left column to right column, and no 1 having more than two 1s adjacent
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0
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1, 16, 108, 531, 2119, 7338, 23330, 70369, 204461, 576824, 1589880, 4304373, 11495305, 30376964, 79611466, 207289163, 536963245
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OFFSET
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1,2
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LINKS
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EXAMPLE
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All solutions for n=2
...1.1.1.1...1.1.1.1...1.1.1.1...1.1.1.1...0.0.0.0...0.0.0.1...1.0.0.0
...0.0.0.0...0.0.0.1...1.0.0.0...1.0.0.1...1.1.1.1...1.1.1.1...1.1.1.1
------
...1.0.0.1...1.1.0.0...1.1.0.1...1.1.1.0...1.1.1.0...0.0.1.1...1.0.1.1
...1.1.1.1...0.1.1.1...0.1.1.1...0.0.1.1...1.0.1.1...1.1.1.0...1.1.1.0
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...0.1.1.1...0.1.1.1
...1.1.0.0...1.1.0.1
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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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