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Search: id:A155355
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| A155355 |
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Number of ways to place zero or more nonadjacent 1,1 2,1 2,2 3,0 3,1 3,2 3,3 4,1 polyhexes in any orientation on a planar nXnXn triangular grid. |
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+0
1
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| 1, 4, 13, 28, 49, 171, 1310, 8460, 42491, 242978, 2107793, 27648766, 373047925, 4984501036, 77677934468, 1580716536075, 41780194476260
(list; graph; listen)
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OFFSET
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4,2
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COMMENT
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Same series for 1,1 2,1 3,0 3,1 3,2 3,3 4,1 polyhexes.
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EXAMPLE
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Maximal 9 X 9 X 9 example
...........0
..........1.0
.........1.1.0
........1.1.1.1
.......0.0.0.1.0
......1.1.0.0.0.1
.....0.1.0.0.0.1.1
....0.1.1.0.1.1.1.1
...0.1.1.1.0.1.0.0.0
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CROSSREFS
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Sequence in context: A155392 A155435 A155371 this_sequence A155356 A060488 A054968
Adjacent sequences: A155352 A155353 A155354 this_sequence A155356 A155357 A155358
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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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