A226402 Number of nondecreasing -n..n vectors of length 5 whose dot product with some nonincreasing -n..n vector equals 5

2, 38, 258, 874, 2674, 5272, 10554, 18170, 30814, 48204, 75312, 108574, 158900, 219746, 304160, 405086, 543242, 698314, 909178, 1146250, 1449110, 1790744, 2228894

Offset

1,1

Comments

Row 5 of A226398

Links

Table of n, a(n) for n=1..23.

Example

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

Crossrefs

Sequence in context: A105645 A098456 A214909 * A217214 A303618 A179503

Adjacent sequences: A226399 A226400 A226401 * A226403 A226404 A226405

Keyword

nonn

Author

R. H. Hardin Jun 06 2013

Status

approved