A202250 Number of zero-sum -6..6 arrays of n elements with adjacent element differences also in -6..6

1, 7, 57, 509, 4643, 43293, 408211, 3882871, 37183105, 358012837, 3462520849, 33613331019, 327348848723, 3196657505737, 31290407955317, 306922478150245, 3016082294628575, 29687026287677819, 292634127970865519

Offset

1,2

Comments

Column 6 of A202252

Links

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

Example

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

Crossrefs

Sequence in context: A291537 A082413 A142990 * A147689 A248168 A176733

Adjacent sequences: A202247 A202248 A202249 * A202251 A202252 A202253

Keyword

nonn

Author

R. H. Hardin Dec 14 2011

Status

approved