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A211843
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
1
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
OFFSET
1,2
COMMENTS
Column 2 of A211849
LINKS
EXAMPLE
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
CROSSREFS
Sequence in context: A001875 A169794 A240418 * A121163 A223621 A215510
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 22 2012
STATUS
approved