A202509 Number of zero-sum -6..6 arrays of n elements with first through third differences also in -6..6

1, 7, 47, 217, 1041, 5429, 29295, 161469, 890659, 4953959, 27653867, 154912145, 870424381, 4906927687, 27742701519, 157251702011, 893270398075, 5083772866943, 28979759201581, 165434751255111, 945621770041509

Offset

1,2

Comments

Column 6 of A202511

Links

R. H. Hardin, Table of n, a(n) for n = 1..127

Example

Some solutions for n=7
..1...-3....3...-4....5...-2....5...-5....3....5....1....0...-6....2....0...-4
.-2....3....4....1....2...-2...-1...-1...-1....2....3....0...-6...-1....6...-4
.-5....5....3....0....2...-3...-2....3...-1....3....2...-1...-2...-1....6...-4
.-3....2....2...-2...-1....1...-2....2....2....2....1....1....2....1....2....0
.-1...-1...-2...-1...-3....4....0....1....2...-1....0....1....4....2...-3....3
..4...-4...-6....0...-2....3....2...-1....0...-5...-1....1....6...-1...-6....4
..6...-2...-4....6...-3...-1...-2....1...-5...-6...-6...-2....2...-2...-5....5

Crossrefs

Sequence in context: A152988 A336789 A201437 * A009202 A093112 A091516

Adjacent sequences: A202506 A202507 A202508 * A202510 A202511 A202512

Keyword

nonn

Author

R. H. Hardin Dec 20 2011

Status

approved