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

Author

R. H. Hardin, Aug 26 2011

Keywords

• nonn

Comments

Column 7 of A194480.

Examples

			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
		

Links

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