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A226399
Number of nondecreasing -n..n vectors of length 2 whose dot product with some nonincreasing -n..n vector equals 2.
1
2, 12, 20, 32, 48, 64, 88, 112, 136, 168, 208, 232, 280, 328, 360, 408, 472, 520, 592, 640, 688, 768, 856, 904, 984, 1080, 1152, 1224, 1336, 1400, 1520, 1616, 1696, 1824, 1920, 1992, 2136, 2280, 2376, 2472, 2632, 2728, 2896, 3016, 3112, 3288, 3472, 3568, 3736
OFFSET
1,1
LINKS
EXAMPLE
Some solutions for n=3:
1 -2 -2 -3 -1 2 -2 -3 -1 0 -1 1 1 -3 -2 -2
2 1 -1 -1 2 2 -2 -2 0 1 -1 1 3 2 0 3
CROSSREFS
Row 2 of A226398.
Sequence in context: A023534 A286683 A326238 * A353399 A121859 A145622
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 06 2013
STATUS
approved