A226395 Number of nondecreasing -4..4 vectors of length n whose dot product with some nonincreasing -4..4 vector equals n

2, 32, 120, 448, 874, 2498, 4280, 10992, 18566, 32056, 52408, 107154, 142740, 232578

Offset

1,1

Comments

Column 4 of A226398

Links

Table of n, a(n) for n=1..14.

Example

Some solutions for n=3
.-4....2...-3...-4...-3...-3...-4....1...-2....1...-3....0....0...-1...-3...-2
.-3....3...-2....0...-2....2...-1....4...-2....1....4....1....3...-1...-3...-1
.-3....3....3....3....0....2....2....4....1....1....4....1....3...-1...-2....0

Crossrefs

Sequence in context: A037313 A122127 A303078 * A257965 A191997 A274654

Adjacent sequences: A226392 A226393 A226394 * A226396 A226397 A226398

Keyword

nonn

Author

R. H. Hardin Jun 06 2013

Status

approved