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A155290
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Number of ways to place zero or more nonadjacent 1,0 1,1 2,1 3,1 4,2 5,2 polyhexes in any orientation on a planar nXnXn triangular grid.
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0
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1, 7, 25, 64, 265, 1577, 11987, 107928, 1180991, 15701569, 264954393, 5697447937, 151647215266
(list; graph; refs; listen; history; internal format)
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OFFSET
| 4,2
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EXAMPLE
| Maximal 11 X 11 X 11 example
.............0
............0.1
...........0.1.1
..........1.1.0.0
.........1.0.0.1.1
........0.0.0.0.1.0
.......1.0.1.0.1.0.1
......1.0.0.1.0.1.0.1
.....0.1.0.1.0.1.0.1.0
....0.1.0.0.1.0.0.0.1.0
...0.1.1.0.1.1.0.0.1.1.0
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CROSSREFS
| Sequence in context: A001845 A127765 A155305 * A056685 A001296 A000970
Adjacent sequences: A155287 A155288 A155289 * A155291 A155292 A155293
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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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