A226417 Number of nondecreasing -3..3 vectors of length n whose dot product with some lexicographically greater or equal nondecreasing -3..3 vector equals n

2, 17, 61, 159, 365, 847, 1488, 2751, 4739, 7551, 11714, 18109, 26101, 37645, 53282, 73032, 98844, 133192, 174317, 227188, 293529, 372908, 470112, 590497, 730305, 899614, 1102423, 1337131, 1613462, 1941278, 2313556, 2748251, 3253127, 3824256

Offset

1,1

Comments

Column 3 of A226422

Links

R. H. Hardin, Table of n, a(n) for n = 1..56

Example

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

Crossrefs

Sequence in context: A175450 A071402 A228641 * A191295 A002430 A160469

Adjacent sequences: A226414 A226415 A226416 * A226418 A226419 A226420

Keyword

nonn

Author

R. H. Hardin Jun 06 2013

Status

approved