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Search: id:A155421
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| A155421 |
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Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,2 4,3 5,4 5,5 polyhexes in any orientation on a planar nXnXn triangular grid. |
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+0
1
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| 1, 4, 10, 22, 55, 192, 618, 2255, 11708, 67218, 421461, 2956054, 24412206, 225564175
(list; graph; listen)
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OFFSET
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5,2
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EXAMPLE
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Maximal 10 X 10 X 10 example
............1
...........1.0
..........0.1.0
.........0.1.0.0
........1.0.1.1.0
.......0.1.0.0.1.1
......0.1.0.0.0.0.0
.....0.0.1.0.0.1.1.0
....0.1.1.0.1.1.0.1.1
...1.1.0.0.1.0.0.0.0.1
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CROSSREFS
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Sequence in context: A155407 A124697 A155426 this_sequence A155343 A155341 A025576
Adjacent sequences: A155418 A155419 A155420 this_sequence A155422 A155423 A155424
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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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