A226339 Number of nondecreasing -7..7 vectors of length n whose dot product with some other -7..7 vector equals n.

2, 90, 578, 2962, 11041, 38678, 114235, 319185, 812075, 1960123, 4443581

Offset

1,1

Links

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

Example

Some solutions for n=3:
.-4...-5...-1....4...-7...-2...-5...-6...-5...-7...-7....5...-3....1...-7...-7
..0...-2....5....5...-3...-2...-3....1...-5...-6...-4....7...-3....7...-5...-1
..7....7....5....7...-2....3...-1....7....7....4....3....7...-3....7...-2....3

Crossrefs

Column 7 of A226340.

Sequence in context: A355574 A076532 A212301 * A157064 A058527 A342329

Adjacent sequences: A226336 A226337 A226338 * A226340 A226341 A226342

Keyword

nonn,more

Author

R. H. Hardin, Jun 04 2013

Status

approved