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A226403
Number of nondecreasing -n..n vectors of length 6 whose dot product with some nonincreasing -n..n vector equals 6.
0
2, 128, 756, 2498, 6900, 17812, 37358, 72000, 130722, 224132, 367754, 580236, 887652, 1319408, 1912914, 2712244
OFFSET
1,1
EXAMPLE
Some solutions for n=3:
2 -1 -3 -3 -3 -3 -2 -3 0 -2 -3 -2 -3 -2 -3 -1
3 -1 -3 -3 0 -1 -2 0 1 -1 0 -2 -2 -2 -3 -1
3 -1 -3 -2 3 -1 -1 0 3 0 1 -2 -2 -2 -3 -1
3 -1 -2 -2 3 2 -1 0 3 0 2 -2 -2 -1 -3 -1
3 1 1 -2 3 2 1 2 3 0 3 2 -2 2 -1 -1
3 1 3 3 3 3 3 3 3 0 3 2 -1 2 -1 2
CROSSREFS
Row 6 of A226398.
Sequence in context: A004864 A106319 A338932 * A106320 A106318 A202748
KEYWORD
nonn,more
AUTHOR
R. H. Hardin, Jun 06 2013
STATUS
approved