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A211843
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Number of nonnegative integer arrays of length n+5 with new values 0 upwards introduced in order, no three adjacent elements all unequal, and containing the value 3
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1
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1, 7, 35, 147, 561, 2013, 6936, 23244, 76434, 248158, 799178, 2561866, 8197109, 26236283, 84147409, 270824081, 875656255, 2846900003, 9313478684, 30675454100, 101762486216, 340118043072, 1145518666868, 3888262008004, 13301838021901
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OFFSET
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1,2
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COMMENTS
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Column 2 of A211849
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..210
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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....1....1....1....0....1....0....1....1....1....1....0....1
..0....1....1....1....1....1....1....1....1....0....1....1....1....1....1....1
..0....2....2....1....2....2....2....1....2....1....1....2....1....2....1....2
..2....1....2....2....2....2....2....1....2....1....2....2....1....2....2....1
..0....2....2....2....3....3....3....2....3....2....1....3....2....3....2....1
..0....2....2....3....3....2....3....2....2....2....1....3....2....3....3....3
..3....3....3....3....1....3....3....3....2....3....3....2....3....0....2....1
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CROSSREFS
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Sequence in context: A001875 A169794 A240418 * A121163 A223621 A215510
Adjacent sequences: A211840 A211841 A211842 * A211844 A211845 A211846
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Apr 22 2012
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STATUS
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approved
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