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Search: id:A163688
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| A163688 |
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Number of nX5 binary arrays with all 1s connected, a path of 1s from upper left corner to lower right corner, and no 1 having more than two 1s adjacent |
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+0
1
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| 1, 13, 83, 389, 1561, 5808, 21608, 81280, 302869, 1103582, 3937976, 13827871, 47923048, 164209208
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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All solutions for n=2
...1.0.0.0.0...1.0.0.0.1...1.1.0.0.0...1.1.0.0.1...1.1.1.0.0...1.1.1.0.0
...1.1.1.1.1...1.1.1.1.1...0.1.1.1.1...0.1.1.1.1...0.0.1.1.1...1.0.1.1.1
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...1.1.1.0.1...1.1.1.0.1...1.1.1.1.0...1.1.1.1.0...1.1.1.1.1...1.1.1.1.1
...0.0.1.1.1...1.0.1.1.1...0.0.0.1.1...1.0.0.1.1...0.0.0.0.1...1.0.0.0.1
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...1.0.1.1.1
...1.1.1.0.1
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CROSSREFS
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Sequence in context: A082203 A101102 A142085 this_sequence A010025 A001848 A055843
Adjacent sequences: A163685 A163686 A163687 this_sequence A163689 A163690 A163691
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhhardin(AT)att.net) Aug 03 2009
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