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A243599
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Number of length n+2 0..n arrays with no three elements in a row with pattern aba (with a!=b) and new values 0..n introduced in 0..n order.
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1
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3, 9, 28, 96, 365, 1533, 7049, 35166, 188834, 1084179, 6618471, 42756207, 291120550, 2081922514, 15590248867, 121920095673, 993343650911, 8414029179364, 73953763887276, 673316834487161, 6340176007793059, 61657373569634585
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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=5
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..1....0....0....1....1....1....0....1....1....1....0....1....1....1....0....1
..2....1....0....2....2....1....1....2....1....2....0....2....1....1....1....2
..2....2....0....2....0....1....2....2....2....3....1....2....1....0....2....2
..3....2....1....0....3....1....0....3....2....4....2....3....0....2....2....1
..0....0....2....0....3....0....3....4....3....2....3....0....0....2....2....0
..0....3....3....2....0....2....1....2....4....3....4....1....2....1....1....3
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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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