A226411 Number of nondecreasing -n..n vectors of length 3 whose dot product with some nondecreasing -n..n vector equals 3.

4, 23, 74, 130, 240, 358, 566, 766, 1112, 1408, 1916, 2362, 3066, 3656, 4564, 5348, 6544, 7522, 9014, 10184, 11966, 13430, 15602, 17366, 19820, 21858, 24814, 27150, 30580, 33202, 37118, 40226, 44656, 48144, 52814, 56696, 62264, 66626, 72796, 77444

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..127

Example

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

Crossrefs

Row 3 of A226410.

Sequence in context: A085505 A065972 A132112 * A226342 A071246 A219933

Adjacent sequences: A226408 A226409 A226410 * A226412 A226413 A226414

Keyword

nonn

Author

R. H. Hardin, Jun 06 2013

Status

approved