A221316 Number of nonnegative integer arrays of length n summing to n without equal adjacent values modulo 3.

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

Author

R. H. Hardin, Jan 10 2013

Keywords

• nonn

Comments

Column 3 of A221321.

Examples

			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
		

Links

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

Crossrefs

Cf. A221321.