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A155262
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Number of ways to place zero or more nonadjacent 1,1 2,1 2,2 3,0 3,1 4,2 polyhexes in any orientation on a planar nXnXn triangular grid.
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0
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1, 13, 37, 73, 270, 3023, 31666, 204526, 1765714, 30617532, 748500437, 15766186082, 363909913887, 12760152079877, 642694450893529
(list; graph; refs; listen; history; internal format)
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OFFSET
| 4,2
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COMMENTS
| Same series for 1,0 2,0 2,1 2,2 3,0 4,1 polyhexes.
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EXAMPLE
| Maximal 11 X 11 X 11 example
.............0
............1.0
...........0.1.1
..........1.1.0.0
.........0.1.0.1.1
........0.0.0.0.1.0
.......0.1.0.1.0.1.1
......0.1.1.1.0.1.0.0
.....1.0.0.0.1.0.0.0.1
....0.1.1.1.0.0.1.1.1.0
...0.1.0.1.0.0.0.1.0.1.0
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CROSSREFS
| Sequence in context: A003154 A083577 A155285 * A155301 A155284 A155304
Adjacent sequences: A155259 A155260 A155261 * A155263 A155264 A155265
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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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