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A155254
Number of ways to place zero or more nonadjacent 1,0 2,0 2,1 2,2 3,0 4,0 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 7, 25, 76, 295, 1744, 13870, 129297, 1393351, 18761115, 322004760, 6998296402, 187297012609
OFFSET
4,2
EXAMPLE
Maximal 11 X 11 X 11 example
.............1
............1.0
...........1.0.1
..........1.1.0.1
.........0.0.1.0.1
........1.0.0.0.1.1
.......1.1.1.0.1.0.0
......1.0.0.0.0.0.0.1
.....1.0.1.0.1.0.1.1.1
....0.0.1.0.0.1.0.0.0.1
...1.1.1.1.0.1.1.1.1.0.1
CROSSREFS
Sequence in context: A294837 A117152 A155281 * A155295 A168589 A058481
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved