A226400 Number of nondecreasing -n..n vectors of length 3 whose dot product with some nonincreasing -n..n vector equals 3.

2, 12, 68, 120, 224, 344, 552, 752, 1100, 1398, 1904, 2356, 3062, 3650, 4558, 5348, 6544, 7526, 9010, 10184, 11972, 13438, 15608, 17376, 19826, 21872, 24828, 27166, 30592, 33222, 37132, 40254, 44680, 48172, 52840, 56726, 62294, 66656, 72826, 77476

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..121

Example

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

Crossrefs

Row 3 of A226398.

Sequence in context: A020062 A185035 A185235 * A000954 A056636 A174327

Adjacent sequences: A226397 A226398 A226399 * A226401 A226402 A226403

Keyword

nonn

Author

R. H. Hardin, Jun 06 2013

Status

approved