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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A211849

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

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

Adjacent sequences:  A211840 A211841 A211842 * A211844 A211845 A211846

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 22 2012

STATUS

approved

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Last modified June 29 05:16 EDT 2022. Contains 354910 sequences. (Running on oeis4.)