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A221316
Number of nonnegative integer arrays of length n summing to n without equal adjacent values modulo 3.
1
1, 2, 6, 8, 19, 44, 84, 212, 474, 1008, 2438, 5436, 12045, 28174, 63292, 142936, 330285, 748286, 1707460, 3930660, 8968641, 20569786, 47335822, 108517496, 249608726, 574843912, 1322068800, 3046723144, 7024972918, 16192943826, 37371650024
OFFSET
1,2
COMMENTS
Column 3 of A221321.
LINKS
EXAMPLE
Some solutions for n=6
..0....1....1....4....0....0....2....0....0....1....3....1....0....0....0....1
..1....0....3....0....2....1....1....2....1....0....1....0....1....1....2....0
..2....1....1....1....1....2....0....1....0....2....0....1....3....0....0....1
..0....3....0....0....0....1....2....2....2....0....1....2....1....4....2....0
..1....1....1....1....1....2....1....1....1....1....0....0....0....0....0....1
..2....0....0....0....2....0....0....0....2....2....1....2....1....1....2....3
CROSSREFS
Cf. A221321.
Sequence in context: A323859 A365918 A098092 * A106164 A216205 A072230
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 10 2013
STATUS
approved