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A211844
Number of nonnegative integer arrays of length n+7 with new values 0 upwards introduced in order, no three adjacent elements all unequal, and containing the value 4
1
1, 9, 56, 286, 1302, 5486, 21897, 84003, 312864, 1139408, 4079404, 14417732, 50465519, 175400683, 606660198, 2091805472, 7201476498, 24786314450, 85384391951, 294672813537, 1019666296658, 3540327824374, 12341347668900
OFFSET
1,2
COMMENTS
Column 3 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....0....0....1....1....1....1....0....1....1....1....1....0
..0....1....1....1....1....1....1....1....1....1....0....1....0....0....1....1
..0....2....2....2....1....1....2....2....2....2....1....2....0....0....2....1
..2....1....2....2....2....2....2....1....2....2....1....2....2....2....2....2
..2....1....3....3....2....2....0....1....3....2....2....3....2....0....2....2
..3....3....3....2....3....3....0....3....2....3....2....3....3....0....3....3
..3....3....4....2....3....3....3....3....2....2....3....4....3....3....3....3
..4....3....4....2....4....4....3....4....4....2....3....4....3....3....3....3
..4....4....0....4....4....3....4....3....2....4....4....4....4....4....4....4
CROSSREFS
Sequence in context: A203838 A097556 A196861 * A172065 A002055 A026842
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 22 2012
STATUS
approved