A221320 Number of nonnegative integer arrays of length n summing to n without equal adjacent values modulo 7.

1, 2, 7, 14, 30, 76, 188, 444, 1075, 2656, 6499, 15904, 39257, 97012, 239836, 594484, 1476309, 3670470, 9137025, 22774518, 56827616, 141930316, 354803429, 887699408, 2222657891, 5569118954, 13963300515, 35031289966, 87937202200, 220862633536

Offset: 1

Author

R. H. Hardin Jan 10 2013

Keywords

• nonn

Comments

Column 7 of A221321

Examples

			Some solutions for n=10
..1....0....0....3....0....1....0....0....1....1....2....1....1....1....1....0
..2....2....2....2....2....0....3....2....3....0....0....0....0....0....0....1
..1....0....3....1....0....1....1....1....0....1....1....1....1....1....2....2
..2....2....0....0....1....0....0....0....1....0....2....4....2....3....0....0
..0....0....1....1....3....3....2....2....3....2....1....1....1....0....1....1
..1....2....0....0....0....0....0....0....0....1....0....0....0....2....0....0
..2....0....1....1....1....4....3....2....1....4....2....2....2....0....3....3
..0....2....0....0....0....0....0....1....0....0....0....0....1....2....0....0
..1....0....1....2....3....1....1....2....1....1....2....1....0....1....2....3
..0....2....2....0....0....0....0....0....0....0....0....0....2....0....1....0
		

Links

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