A221318 Number of nonnegative integer arrays of length n summing to n without equal adjacent values modulo 5

1, 2, 7, 14, 30, 76, 185, 430, 1044, 2544, 6154, 15002, 36691, 89918, 220728, 543054, 1338428, 3302916, 8162806, 20197554, 50030332, 124053930, 307882669, 764770230, 1901144731, 4729494390, 11773517941, 29327102054, 73094698149, 182280159290

Offset

1,2

Comments

Column 5 of A221321

Links

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

Example

Some solutions for n=8
..0....0....0....1....0....1....0....1....1....0....0....0....0....1....1....1
..1....2....1....3....1....0....1....3....2....2....3....4....2....3....4....3
..0....0....3....0....2....1....2....0....1....0....0....0....1....1....0....0
..3....1....0....1....3....3....0....2....0....4....3....1....0....0....1....1
..0....0....1....0....1....2....1....1....1....1....1....0....2....1....0....2
..1....2....2....2....0....0....2....0....0....0....0....1....0....0....1....0
..3....3....1....1....1....1....0....1....2....1....1....0....3....2....0....1
..0....0....0....0....0....0....2....0....1....0....0....2....0....0....1....0

Crossrefs

Sequence in context: A289408 A290519 A120739 * A221319 A221320 A221235

Adjacent sequences: A221315 A221316 A221317 * A221319 A221320 A221321

Keyword

nonn

Author

R. H. Hardin Jan 10 2013

Status

approved