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A155389
Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 4,1 4,2 4,3 4,4 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 4, 10, 19, 34, 64, 213, 1157, 6478, 33461, 167462, 890029, 6064749, 55393044, 595987834, 6995484146, 87602949947
OFFSET
4,2
EXAMPLE
Maximal 11 X 11 X 11 example
.............0
............1.1
...........1.0.1
..........1.0.0.1
.........1.0.1.0.1
........0.0.1.0.0.0
.......1.0.1.0.0.0.1
......1.0.1.0.0.0.0.1
.....1.0.0.1.1.1.1.0.1
....1.0.0.0.0.0.0.0.0.1
...0.1.1.1.1.0.1.1.1.1.0
CROSSREFS
Sequence in context: A155368 A301155 A301215 * A155316 A346760 A038418
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved