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A243037
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Number of length n+3 0..n arrays with no four elements in a row with pattern abab (with a!=b) and new values 0..n introduced in 0..n order
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1
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7, 36, 163, 738, 3516, 17919, 97849, 570383, 3532239, 23132758, 159573602, 1155434411, 8755269880, 69244208899, 570254905607, 4879985079384, 43312872677674, 398041803812734, 3781687068799550, 37091840207913759
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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....1....1....0....1....1....1....1....1....1....1....0....0....1....1....1
..2....2....2....1....2....2....2....0....2....2....0....0....1....1....2....2
..0....3....2....2....1....2....2....0....3....1....2....1....0....2....2....2
..2....4....3....1....0....2....1....1....3....3....3....0....2....3....3....1
..3....1....3....0....1....2....3....2....4....2....1....2....3....1....4....3
..2....1....2....0....1....0....3....3....4....3....3....0....4....3....3....2
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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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