A226335 Number of nondecreasing -3..3 vectors of length n whose dot product with some other -3..3 vector equals n

2, 22, 74, 193, 419, 921, 1640, 2951, 4945, 7927, 12208, 18546, 26895, 38603, 54098, 74397, 100548, 134530, 176581, 229884, 295652, 376281, 474241, 593586, 735301, 905513, 1106878, 1344022, 1621789, 1947335, 2323081, 2759434

Offset

1,1

Comments

Column 3 of A226340

Links

Table of n, a(n) for n=1..32.

Example

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

Crossrefs

Sequence in context: A156480 A348488 A226406 * A123061 A050853 A291915

Adjacent sequences: A226332 A226333 A226334 * A226336 A226337 A226338

Keyword

nonn

Author

R. H. Hardin Jun 04 2013

Status

approved