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Search: id:A155407
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| A155407 |
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Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 2,2 3,1 3,2 4,3 4,4 polyhexes in any orientation on a planar nXnXn triangular grid. |
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+0
1
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| 1, 4, 10, 22, 49, 162, 562, 3016, 16877, 98214, 637805, 5164375, 49219867, 557800561, 7204177132, 106101558795
(list; graph; listen)
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OFFSET
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4,2
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EXAMPLE
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Maximal 9 X 9 X 9 example
...........1
..........0.1
.........1.1.0
........0.1.1.0
.......1.1.0.0.1
......0.0.0.0.1.0
.....0.1.0.0.0.1.1
....1.1.1.1.0.1.1.0
...1.0.1.0.1.0.0.1.1
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CROSSREFS
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Sequence in context: A056112 A118430 A137247 this_sequence A124697 A155426 A155421
Adjacent sequences: A155404 A155405 A155406 this_sequence A155408 A155409 A155410
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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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