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A155252
Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 2,1 3,0 4,0 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 13, 37, 136, 1052, 6406, 55531, 723614, 9622394, 173749962, 4072845906, 113648899144
OFFSET
4,2
EXAMPLE
Maximal 11 X 11 X 11 example
.............0
............0.1
...........0.0.1
..........1.0.0.1
.........1.0.0.1.1
........1.0.0.0.1.0
.......1.1.0.0.0.0.0
......0.1.0.0.0.1.1.0
.....0.0.0.1.1.1.1.0.0
....1.1.0.0.0.0.0.0.1.1
...0.1.1.1.1.0.1.1.1.1.0
CROSSREFS
Sequence in context: A195543 A262755 A155300 * A265653 A206443 A155297
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved