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A155291
Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,0 4,1 5,1 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 7, 25, 70, 430, 2529, 13389, 123723, 1442773, 16315566, 272990681, 5489382645
OFFSET
4,2
EXAMPLE
Maximal 11 X 11 X 11 example
.............0
............1.1
...........0.0.1
..........0.1.0.1
.........1.1.0.1.0
........1.0.0.0.1.0
.......1.0.0.1.0.0.1
......0.1.0.1.0.0.0.1
.....0.0.0.0.1.0.0.1.0
....1.1.1.0.0.1.1.0.1.0
...1.0.0.1.1.0.0.1.0.1.1
CROSSREFS
Sequence in context: A247620 A240156 A155245 * A155221 A213569 A299269
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved