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A155294
Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 4,0 4,1 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 7, 25, 82, 484, 2877, 16189, 154910, 1843060, 22931773, 396812328, 8261826866
OFFSET
4,2
EXAMPLE
Maximal 13 X 13 X 13 example
...............1
..............0.1
.............1.1.0
............1.0.0.0
...........1.0.0.0.1
..........0.0.0.0.1.0
.........1.1.0.0.0.1.1
........1.0.1.1.1.0.0.1
.......0.0.0.0.0.0.1.0.1
......1.1.1.0.1.0.0.1.0.0
.....0.0.0.1.1.0.1.1.0.0.0
....1.1.0.0.0.0.1.0.0.0.1.1
...1.0.1.1.1.0.1.0.1.1.1.0.1
CROSSREFS
Sequence in context: A168589 A058481 A220387 * A155233 A183914 A279216
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved