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A155259
Number of ways to place zero or more nonadjacent 0,0 1,0 1,1 2,0 3,0 4,1 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 13, 37, 111, 999, 5261, 42873, 550367, 5937880, 97204725, 2096426420, 47838274736
OFFSET
4,2
EXAMPLE
Maximal 10 X 10 X 10 example
............0
...........1.1
..........0.0.1
.........1.0.0.1
........1.1.0.1.1
.......1.0.0.0.0.0
......1.0.1.1.0.1.1
.....0.1.0.0.1.0.1.0
....1.0.0.1.0.1.0.1.0
...1.1.1.1.0.1.1.0.1.1
CROSSREFS
Sequence in context: A155228 A126367 A139926 * A155308 A166101 A333281
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved