A202508 Number of zero-sum -5..5 arrays of n elements with first through third differences also in -5..5

1, 5, 27, 115, 529, 2369, 10799, 50519, 235731, 1110857, 5255015, 24917719, 118624427, 566325889, 2711707427, 13018061199, 62630442305, 301891809587, 1457550954737, 7047249198849, 34117462763559, 165364270152729

Offset

1,2

Comments

Column 5 of A202511

Links

R. H. Hardin, Table of n, a(n) for n = 1..171

Example

Some solutions for n=7
.-4....0...-5...-4...-3....2....1....4....0....4...-2...-5....3....2...-5....0
..1....3...-1...-4....2....0....0....2...-3....4...-1...-1...-1....0...-3...-2
..2....2....1...-1....2...-1....0....0...-4....1...-2....1...-2....0...-1...-4
..3...-1....3....3...-1...-3....1...-1...-1...-3...-1....4...-1...-1....0...-3
..2...-4....1....3...-2...-2....2....0....3...-5....2....3....1...-2....1....0
..0...-2...-1....3....0....0...-1...-2....3...-2....3....1....2....0....4....4
.-4....2....2....0....2....4...-3...-3....2....1....1...-3...-2....1....4....5

Crossrefs

Sequence in context: A212783 A226315 A201436 * A129868 A069993 A249995

Adjacent sequences: A202505 A202506 A202507 * A202509 A202510 A202511

Keyword

nonn

Author

R. H. Hardin Dec 20 2011

Status

approved