login
A155301
Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,1 3,2 4,1 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 13, 37, 73, 274, 2707, 30458, 210247, 1927098, 30544775, 732699440, 16750707651, 417262694530, 14440304500005, 706310189376904
OFFSET
4,2
EXAMPLE
Maximal 13 X 13 X 13 example
...............0
..............0.1
.............1.1.0
............1.0.1.0
...........0.1.0.0.0
..........0.0.0.0.0.0
.........1.0.0.0.0.0.1
........1.0.1.0.0.1.0.1
.......0.1.1.0.0.0.1.1.0
......1.0.0.1.0.0.1.0.0.1
.....1.0.1.0.0.1.0.0.1.0.1
....0.1.1.0.1.1.0.1.0.1.1.0
...0.0.0.1.0.0.1.1.0.1.0.0.0
CROSSREFS
Sequence in context: A083577 A155285 A155262 * A155284 A155304 A183454
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved