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A155223
Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 4, 10, 45, 176, 869, 5649, 44314, 456024, 5472215, 82109824, 1515983373, 34737855825, 992142189277
OFFSET
3,2
EXAMPLE
Maximal 12 X 12 X 12 example
..............0
.............1.0
............1.0.0
...........1.0.0.1
..........1.0.1.0.1
.........0.0.0.1.0.1
........1.0.1.0.1.0.1
.......1.0.1.0.0.1.0.0
......1.0.1.0.0.0.0.0.1
.....1.0.1.0.1.1.1.1.0.1
....0.0.0.0.0.0.0.0.0.0.1
...0.1.1.1.1.0.1.1.1.1.0.1
CROSSREFS
Sequence in context: A155330 A155278 A155237 * A155219 A153985 A184481
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved