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A155423
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Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,2 5,2 6,3 7,3 polyhexes in any orientation on a planar nXnXn triangular grid.
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0
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1, 7, 19, 52, 172, 643, 2936, 14954, 84090, 537490, 4238593, 38671134
(list; graph; refs; listen; history; internal format)
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OFFSET
| 7,2
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EXAMPLE
| Maximal 10 X 10 X 10 example
............0
...........0.0
..........1.0.1
.........1.0.0.1
........0.1.0.1.0
.......0.1.0.0.1.0
......0.0.1.0.1.0.0
.....0.0.1.0.0.1.0.0
....0.0.0.1.0.1.0.0.0
...0.0.0.1.0.0.1.0.0.0
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CROSSREFS
| Sequence in context: A100545 A203165 A100450 * A155347 A155385 A155345
Adjacent sequences: A155420 A155421 A155422 * A155424 A155425 A155426
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KEYWORD
| nonn
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net) Jan 22 2009
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