A226338 Number of nondecreasing -6..6 vectors of length n whose dot product with some other -6..6 vector equals n

2, 66, 362, 1736, 5621, 18509, 48341, 125429, 288869, 645578, 1338336, 2704063, 5170784, 9654395, 17329591, 30416751, 51788999, 86492839

Offset

1,1

Comments

Column 6 of A226340

Links

Table of n, a(n) for n=1..18.

Example

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

Crossrefs

Sequence in context: A257788 A349108 A226409 * A131472 A098532 A159716

Adjacent sequences: A226335 A226336 A226337 * A226339 A226340 A226341

Keyword

nonn

Author

R. H. Hardin Jun 04 2013

Status

approved