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A211842
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Number of nonnegative integer arrays of length n+3 with new values 0 upwards introduced in order, no three adjacent elements all unequal, and containing the value 2.
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1
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1, 5, 19, 63, 196, 588, 1731, 5049, 14689, 42809, 125364, 369678, 1099339, 3300091, 10006487, 30658799, 94932890, 297079702, 939477265, 3001846219, 9689289277, 31586215805, 103968208826, 345457027212, 1158435912189, 3919502591649
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=3
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..1....1....1....1....0....1....0....1....0....1....1....1....0....1....0....1
..1....1....1....1....1....0....1....1....1....0....1....1....0....0....1....1
..1....1....1....2....1....0....0....0....1....1....2....2....1....0....1....2
..2....1....2....2....2....0....0....0....2....1....1....2....1....2....1....2
..2....2....1....3....2....2....2....2....1....2....2....1....2....2....2....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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