A226404 Number of nondecreasing -n..n vectors of length 7 whose dot product with some nonincreasing -n..n vector equals 7

2, 92, 1012, 4280, 15614, 41428, 109062, 228130, 457746, 838870, 1503000

Offset

1,1

Comments

Row 7 of A226398

Links

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

Example

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

Crossrefs

Sequence in context: A116293 A030985 A053313 * A166825 A348852 A365852

Adjacent sequences: A226401 A226402 A226403 * A226405 A226406 A226407

Keyword

nonn

Author

R. H. Hardin Jun 06 2013

Status

approved