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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

Column 7 of A194136.

LINKS

Table of n, a(n) for n=1..21.

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: A246115 A068182 A218415 * A114224 A201845 A218692

Adjacent sequences:  A194132 A194133 A194134 * A194136 A194137 A194138

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 17 2011

STATUS

approved

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Last modified October 22 08:00 EDT 2019. Contains 328315 sequences. (Running on oeis4.)