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A155295
Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 4,1 4,2 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 7, 25, 76, 301, 1771, 13115, 121281, 1334281, 18017445, 303093919, 6474405256
OFFSET
4,2
EXAMPLE
Maximal 11 X 11 X 11 example
.............0
............0.1
...........1.1.1
..........1.0.0.0
.........1.0.0.0.0
........0.0.0.0.1.0
.......1.0.1.0.1.1.1
......1.0.0.1.0.0.0.1
.....1.0.0.0.1.0.1.0.1
....0.1.0.0.1.0.1.1.0.0
...0.1.1.0.1.1.0.0.1.1.1
CROSSREFS
Sequence in context: A117152 A155281 A155254 * A168589 A058481 A220387
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved