A226346 Number of nondecreasing -n..n vectors of length 7 whose dot product with some other -n..n vector equals 7

8, 281, 1640, 6068, 19046, 48341, 114235, 238393, 472550, 866608, 1539323

Offset

1,1

Comments

Row 7 of A226340

Links

Table of n, a(n) for n=1..11.

Example

Some solutions for n=3
..2...-2...-2...-1...-2...-2...-2...-3...-2....1...-2...-3...-2...-1...-3...-3
..2....0...-2....0...-2...-1...-2...-3....0....1...-2...-3...-1...-1...-2....1
..2....0...-1....1...-2....0...-2...-3....0....3...-2....1....1....1....0....1
..3....1...-1....1...-1....1...-2....1....2....3...-1....1....1....1....0....2
..3....1...-1....2...-1....2...-2....1....2....3....1....1....3....1....0....2
..3....1....0....3...-1....2...-1....2....2....3....3....3....3....1....1....3
..3....1....0....3....1....3....0....2....3....3....3....3....3....3....2....3

Crossrefs

Sequence in context: A247215 A079929 A226415 * A217488 A332128 A247484

Adjacent sequences: A226343 A226344 A226345 * A226347 A226348 A226349

Keyword

nonn

Author

R. H. Hardin Jun 04 2013

Status

approved