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A155299
Number of ways to place zero or more nonadjacent 1,1 2,1 3,0 3,1 4,2 5,3 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 7, 19, 37, 100, 478, 3236, 19635, 120080, 957011, 10308520, 134839273, 1943304769, 32282816021, 657583832803, 16484816876989
OFFSET
5,2
EXAMPLE
Maximal 12 X 12 X 12 example
..............0
.............0.0
............0.0.0
...........0.0.0.0
..........0.1.0.1.0
.........0.1.0.0.1.0
........1.1.0.0.0.1.1
.......0.0.1.0.0.1.0.0
......1.0.0.1.0.1.0.0.1
.....0.1.0.0.0.0.0.0.1.0
....0.0.1.1.1.0.1.1.1.0.0
...0.0.1.0.0.0.0.0.0.1.0.0
CROSSREFS
Sequence in context: A155424 A155349 A155437 * A155379 A155243 A155417
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved