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A194135
Number of ways to arrange 7 indistinguishable points on an n X n X n triangular grid so that no three points are collinear at any angle.
0
0, 0, 0, 0, 9, 1875, 52323, 695616, 5840088, 35715529, 172520643, 708871152, 2517687856, 8023634766, 23292994812, 62357664744, 155765126265, 367482996726, 822866800569, 1762214894004, 3621792301059
OFFSET
1,5
COMMENTS
Column 7 of A194136.
EXAMPLE
Some solutions for 5 X 5 X 5:
......0..........0..........0..........0..........0..........0..........0
.....0.1........1.0........1.0........0.1........0.1........1.0........1.1
....1.0.1......1.0.1......0.1.1......1.1.0......1.1.0......0.1.1......0.0.1
...1.0.1.0....0.1.0.1....1.0.0.1....1.0.0.1....0.0.1.1....1.1.0.0....1.1.0.0
..0.1.0.1.0..0.1.0.1.0..0.1.1.0.0..0.0.1.1.0..1.0.1.0.0..0.0.1.0.1..0.0.1.1.0
CROSSREFS
Sequence in context: A068182 A368368 A218415 * A114224 A201845 A218692
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 17 2011
STATUS
approved