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A155375
Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 2,1 3,0 4,0 4,1 5,0 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 4, 13, 37, 146, 614, 2467, 11092, 69586, 500162, 4040869, 39876354, 445952771
OFFSET
5,2
EXAMPLE
Maximal 9 X 9 X 9 example
...........1
..........0.1
.........0.1.1
........1.0.0.1
.......1.0.0.1.1
......1.1.0.0.0.1
.....1.0.0.0.0.0.0
....1.1.0.0.1.0.1.0
...1.0.0.1.1.1.1.1.1
CROSSREFS
Sequence in context: A067633 A297391 A108489 * A155307 A155344 A155418
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved