A221317 Number of nonnegative integer arrays of length n summing to n without equal adjacent values modulo 4

1, 2, 7, 14, 28, 66, 168, 378, 866, 2128, 5065, 12000, 28866, 69652, 167994, 405058, 981305, 2381232, 5776411, 14040684, 34175851, 83246764, 202960219, 495273680, 1209625253, 2956269734, 7229756488, 17692733704, 43322486571, 106136686984

Offset

1,2

Comments

Column 4 of A221321

Links

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

Example

Some solutions for n=7
..0....2....1....3....0....0....0....1....0....0....2....0....3....1....0....1
..3....0....3....2....2....1....1....0....1....1....1....5....0....0....2....2
..0....1....0....0....0....2....0....2....0....0....0....0....1....2....0....1
..1....3....2....1....1....1....2....1....1....3....1....1....0....0....2....0
..0....0....0....0....0....0....1....0....0....0....0....0....1....1....1....1
..1....1....1....1....1....1....0....1....5....3....2....1....0....3....2....0
..2....0....0....0....3....2....3....2....0....0....1....0....2....0....0....2

Crossrefs

Sequence in context: A200084 A184704 A295963 * A005998 A122751 A152944

Adjacent sequences: A221314 A221315 A221316 * A221318 A221319 A221320

Keyword

nonn

Author

R. H. Hardin Jan 10 2013

Status

approved