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A155224
Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,1 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 4, 13, 28, 111, 977, 7280, 55365, 714096, 13471597, 269297226, 6772718447, 245090678582, 11547321954885, 661077498433706, 49292298477002834, 4904773608293842400
OFFSET
2,2
COMMENTS
Same series for 0,0 1,0 1,1 2,0 2,1 polyhexes.
EXAMPLE
Maximal 9 X 9 X 9 example
...........0
..........1.1
.........1.0.1
........0.0.0.0
.......0.1.0.1.0
......0.0.1.1.0.0
.....1.0.0.0.0.0.1
....0.1.0.1.1.0.1.0
...1.1.0.1.0.1.0.1.1
CROSSREFS
Sequence in context: A155413 A155326 A155257 * A155238 A155320 A155279
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved