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A155298
Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,0 4,1 5,2 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 7, 25, 55, 229, 1191, 8727, 74357, 700043, 7963463, 116098934, 2137593164, 48102627816
OFFSET
4,2
EXAMPLE
Maximal 11 X 11 X 11 example
.............0
............0.0
...........1.1.1
..........1.0.0.1
.........1.0.0.0.0
........0.0.0.1.1.1
.......1.1.0.1.0.0.0
......1.0.0.1.0.1.1.1
.....1.0.1.0.1.0.0.0.1
....0.1.0.1.0.0.1.0.0.1
...0.0.1.0.1.1.1.0.0.1.0
CROSSREFS
Sequence in context: A155289 A155306 A155240 * A155292 A155276 A155270
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved