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A242542
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Number of length n+3 0..n arrays with no four elements in a row with pattern aabb (possibly a=b) and new values 0..n introduced in 0..n order
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1
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6, 32, 150, 690, 3311, 16968, 93103, 544920, 3386262, 22243902, 153850981, 1116625523, 8478969009, 67185160511, 554235206898, 4750165417926, 42219358673456, 388485398829204, 3695187060252009, 36282147267628868
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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
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..1....0....1....0....1....1....1....1....1....1....1....1....1....1....1....1
..2....1....0....1....0....2....2....2....1....2....2....1....1....0....1....2
..0....2....2....2....2....0....2....1....0....1....0....2....1....2....0....1
..1....2....2....1....0....3....1....0....2....3....2....1....0....1....1....2
..0....1....1....3....3....1....3....2....1....3....3....1....1....0....0....1
..3....2....0....2....0....3....4....3....3....2....2....2....1....0....2....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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