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A155344
Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,0 4,1 5,0 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 4, 13, 37, 146, 632, 2601, 11932, 76177, 558787, 4627682, 46978044, 543470526
OFFSET
5,2
EXAMPLE
Maximal 9 X 9 X 9 example
...........0
..........0.1
.........1.0.1
........1.0.1.0
.......0.1.0.1.0
......0.1.0.0.1.1
.....1.1.0.0.0.0.1
....1.0.0.1.1.1.0.0
...0.0.1.1.0.0.1.1.0
CROSSREFS
Sequence in context: A108489 A155375 A155307 * A155418 A155235 A024450
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved