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A155362
Number of ways to place zero or more nonadjacent 0,0 1,0 1,1 2,0 2,2 3,1 3,2 4,2 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 4, 10, 19, 31, 142, 704, 3110, 11340, 67080, 521405, 4456035, 36267075, 359062706, 4494388097, 66854020627, 1071365619565, 19550448735686
OFFSET
4,2
EXAMPLE
Maximal 9 X 9 X 9 example
...........1
..........1.1
.........1.0.1
........0.1.1.0
.......0.0.1.0.0
......0.0.0.0.0.0
.....1.1.1.0.1.1.1
....1.0.1.0.0.1.0.1
...1.1.1.0.0.0.1.1.1
CROSSREFS
Sequence in context: A063773 A155432 A155302 * A034966 A301256 A301092
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved