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A155289
Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 3,2 4,3 polyhexes in any orientation on a planar nXnXn triangular grid.
0
1, 7, 25, 55, 208, 1150, 9013, 76658, 703883, 8056303, 122331252, 2348850844, 54143239435
OFFSET
4,2
EXAMPLE
Maximal 12 X 12 X 12 example
..............0
.............0.0
............1.1.1
...........1.0.0.0
..........0.1.0.0.1
.........0.1.0.0.0.1
........0.0.0.0.0.0.1
.......1.0.0.1.0.1.1.0
......1.0.0.1.0.1.0.0.0
.....1.0.0.1.0.0.0.0.1.1
....0.1.1.0.1.1.0.1.1.0.1
...0.0.0.1.0.0.1.0.0.0.0.1
CROSSREFS
Sequence in context: A155288 A155293 A155311 * A155306 A155240 A155298
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 22 2009
STATUS
approved