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A155333
Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 4,1 5,2 6,3 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 7, 19, 70, 241, 813, 4400, 23369, 158297, 1249218, 10771936, 115482200
OFFSET
6,2
EXAMPLE
Maximal 12 X 12 X 12 example
..............0
.............0.1
............0.0.1
...........0.0.0.1
..........0.0.0.0.1
.........1.0.0.0.1.0
........1.0.0.0.1.0.1
.......1.0.0.0.1.0.1.0
......1.0.0.0.0.0.1.0.1
.....0.1.0.1.1.1.1.0.1.0
....0.0.1.0.0.0.0.0.1.0.0
...0.0.0.1.0.1.1.1.1.0.0.0
CROSSREFS
Sequence in context: A228026 A122484 A155242 * A155296 A155463 A318483
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved