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A155385
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Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 3,1 4,1 5,2 6,3 polyhexes in any orientation on a planar nXnXn triangular grid.
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0
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1, 7, 19, 52, 181, 571, 2900, 15410, 91393, 670564, 5234213, 49806306, 539502855
(list; graph; refs; listen; history; internal format)
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OFFSET
| 6,2
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EXAMPLE
| Maximal 12 X 12 X 12 example
..............1
.............0.1
............1.0.1
...........1.0.1.1
..........1.0.0.1.0
.........1.1.0.1.0.1
........0.1.0.1.0.0.1
.......0.0.1.0.0.0.0.1
......1.0.0.1.0.0.0.1.1
.....0.1.0.0.0.0.0.0.1.0
....0.0.1.1.0.0.0.0.1.0.0
...0.0.0.1.1.1.1.0.1.0.0.0
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CROSSREFS
| Sequence in context: A100450 A155423 A155347 * A155345 A155309 A155419
Adjacent sequences: A155382 A155383 A155384 * A155386 A155387 A155388
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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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