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Search: id:A155423
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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
1
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| 1, 7, 19, 52, 172, 643, 2936, 14954, 84090, 537490, 4238593, 38671134
(list; graph; listen)
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OFFSET
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7,2
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EXAMPLE
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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
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Sequence in context: A027523 A100545 A100450 this_sequence A155347 A155385 A155345
Adjacent sequences: A155420 A155421 A155422 this_sequence A155424 A155425 A155426
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhhardin(AT)att.net) Jan 22 2009
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