A202249 Number of zero-sum -5..5 arrays of n elements with adjacent element differences also in -5..5.

1, 5, 41, 309, 2385, 18841, 150523, 1212443, 9832015, 80165217, 656550255, 5397261675, 44510060161, 368068132303, 3050896796199, 25341289818675, 210875713442797, 1757652942915635, 14671489102807881, 122627141004142679

Offset

1,2

Comments

Column 5 of A202252.

Links

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

Example

Some solutions for n=6
..0....0...-4....3....0....4...-3...-1...-3....4...-2....3...-4...-4...-1...-1
.-5....2....0...-1....3...-1....2....1...-3...-1....0....3...-5...-4...-2....3
.-2...-2....1...-2....3...-2....3...-2....0...-3....0....2...-1....0....0....0
..3...-3....1...-4...-1...-1....4...-1....3...-2....4...-2....1....1....2...-5
..0....2....0....0...-2....2...-1....3....1....3....1...-1....4....2...-1....0
..4....1....2....4...-3...-2...-5....0....2...-1...-3...-5....5....5....2....3

Crossrefs

Cf. A202252.

Sequence in context: A198688 A337285 A349541 * A067381 A155612 A145215

Adjacent sequences: A202246 A202247 A202248 * A202250 A202251 A202252

Keyword

nonn

Author

R. H. Hardin, Dec 14 2011

Status

approved