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Search: id:A155354
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| A155354 |
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Number of ways to place zero or more nonadjacent 2,0 3,1 4,2 4,3 4,4 5,2 6,2 polyhexes in any orientation on a planar nXnXn triangular grid. |
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+0
1
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| 1, 3, 7, 13, 21, 54, 165, 638, 2331, 9005, 38668, 204465, 1227713, 8257094, 59762784, 487017754, 4487006412, 47257428230, 557362552428
(list; graph; listen)
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OFFSET
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6,2
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EXAMPLE
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Maximal 11 X 11 X 11 example
.............0
............0.0
...........0.0.1
..........0.0.1.0
.........1.1.1.0.0
........0.0.0.1.0.0
.......0.0.1.0.1.0.1
......0.0.1.0.0.0.1.0
.....1.1.1.0.1.1.1.0.0
....0.0.0.1.0.0.0.1.0.0
...0.0.0.0.1.0.0.0.1.0.0
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CROSSREFS
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Sequence in context: A147335 A147464 A146058 this_sequence A136219 A078582 A051336
Adjacent sequences: A155351 A155352 A155353 this_sequence A155355 A155356 A155357
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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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