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A155271
Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 2,1 3,0 4,0 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 7, 25, 105, 639, 3603, 22857, 241966, 2928219, 43585143, 850752020, 19021431704, 530984535190
OFFSET
4,2
EXAMPLE
Maximal 11 X 11 X 11 example
.............1
............1.0
...........1.1.0
..........1.0.0.0
.........1.0.1.0.0
........0.0.0.1.1.0
.......1.0.0.0.1.0.1
......1.0.0.0.0.1.0.1
.....1.0.0.0.0.0.1.0.1
....1.1.0.0.0.1.0.0.1.1
...1.0.0.1.1.1.1.1.0.0.1
CROSSREFS
Sequence in context: A141627 A289606 A102900 * A200152 A255280 A327627
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved