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A155309
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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 polyhexes in any orientation on a planar nXnXn triangular grid.
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0
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1, 7, 19, 52, 196, 938, 5406, 33082, 270615, 2652565, 30092725, 403696211, 6603268906
(list; graph; refs; listen; history; internal format)
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OFFSET
| 5,2
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EXAMPLE
| Maximal 13 X 13 X 13 example
...............0
..............0.0
.............0.0.1
............0.1.1.0
...........1.1.0.0.1
..........1.0.0.0.1.0
.........0.0.1.1.0.1.0
........0.1.1.0.0.1.0.1
.......1.1.0.0.0.0.1.0.1
......0.0.0.1.0.0.1.0.1.0
.....1.1.0.0.1.1.0.0.0.1.0
....0.0.1.1.0.0.1.1.0.1.0.0
...0.0.0.0.1.1.0.0.1.0.1.0.0
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CROSSREFS
| Sequence in context: A155347 A155385 A155345 * A155419 A155246 A155414
Adjacent sequences: A155306 A155307 A155308 * A155310 A155311 A155312
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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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