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A155391
Number of ways to place zero or more nonadjacent 1,1 2,1 3,1 4,0 4,1 5,2 6,3 7,4 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 7, 19, 37, 106, 313, 1348, 6817, 32547, 189413, 1214982, 8891593, 78525607, 761546216
OFFSET
7,2
EXAMPLE
Maximal 11 X 11 X 11 example
.............0
............0.0
...........0.0.0
..........0.0.0.0
.........0.1.0.1.0
........0.1.0.0.1.0
.......0.1.0.0.0.1.0
......1.1.0.0.0.0.1.1
.....0.0.1.0.0.0.1.0.0
....0.0.0.1.0.0.1.0.0.0
...0.0.0.0.1.0.1.0.0.0.0
CROSSREFS
Sequence in context: A155243 A155417 A155416 * A155400 A155359 A098481
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved