A226397 Number of nondecreasing -6..6 vectors of length n whose dot product with some nonincreasing -6..6 vector equals n

2, 64, 344, 1646, 5272, 17812, 41428, 112060, 247684, 582700, 1099228, 2515470, 4309522, 8283534, 15224294, 25736894

Offset

1,1

Comments

Column 6 of A226398

Links

Table of n, a(n) for n=1..16.

Example

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

Crossrefs

Sequence in context: A249073 A064010 A120829 * A264481 A120121 A274656

Adjacent sequences: A226394 A226395 A226396 * A226398 A226399 A226400

Keyword

nonn

Author

R. H. Hardin Jun 06 2013

Status

approved