A226415 Number of nondecreasing -n..n vectors of length 7 whose dot product with some nondecreasing -n..n vector equals 7.

8, 281, 1631, 6041, 18765, 47291, 113273, 235677, 465959, 853593, 1515861

Offset

1,1

Comments

Row 7 of A226410.

Links

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

Example

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

Crossrefs

Cf. A226410.

Sequence in context: A280761 A247215 A079929 * A226346 A217488 A332128

Adjacent sequences: A226412 A226413 A226414 * A226416 A226417 A226418

Keyword

nonn

Author

R. H. Hardin, Jun 06 2013

Status

approved