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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.
1
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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 26 2011
STATUS
approved