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A155397
Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 4,0 4,1 5,0 6,0 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 4, 13, 45, 194, 809, 3321, 15727, 81305, 509040, 3870198, 33980590, 341474106
OFFSET
6,2
EXAMPLE
Maximal 9 X 9 X 9 example
...........1
..........0.1
.........1.0.1
........1.0.1.0
.......1.0.0.1.1
......0.1.0.0.0.1
.....1.1.0.0.0.0.1
....1.0.0.0.1.1.0.0
...1.0.1.1.1.0.1.1.1
CROSSREFS
Sequence in context: A165205 A149431 A149432 * A155328 A096353 A034553
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved