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

1,2

Comments

Column 7 of A221321

Links

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

Example

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

Crossrefs

Sequence in context: A120739 A221318 A221319 * A221235 A224916 A258321

Adjacent sequences: A221317 A221318 A221319 * A221321 A221322 A221323

Keyword

nonn

Author

R. H. Hardin Jan 10 2013

Status

approved