A194479 Number of ways to arrange 7 indistinguishable points on an n X n X n triangular grid so that no three points are in the same row or diagonal.

0, 0, 0, 0, 15, 3525, 98473, 1237434, 9821400, 57367112, 268378248, 1059987987, 3661533037, 11341971885, 32090198922, 84099053568, 206386405560, 478423135296, 1054963957500, 2225704950054, 4514320792971, 8838377453829

Offset

1,5

Comments

Column 7 of A194480.

Links

R. H. Hardin, Table of n, a(n) for n = 1..24

Example

Some solutions for 5 X 5 X 5:
......0..........0..........1..........0..........0..........1..........1
.....1.0........0.1........0.0........1.0........0.1........0.0........0.0
....0.1.1......1.1.0......1.0.1......1.0.1......1.0.1......1.1.0......0.1.1
...1.0.0.1....1.0.0.1....0.1.1.0....0.1.1.0....1.0.1.0....0.0.1.1....1.1.0.0
..0.1.1.0.0..0.0.1.1.0..0.1.0.1.0..0.1.0.0.1..0.1.0.1.0..0.1.1.0.0..0.0.1.1.0

Crossrefs

Sequence in context: A230672 A145189 A182283 * A262019 A153832 A198524

Adjacent sequences: A194476 A194477 A194478 * A194480 A194481 A194482

Keyword

nonn

Author

R. H. Hardin, Aug 26 2011

Status

approved