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Search: id:A155271
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| A155271 |
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Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 2,1 3,0 4,0 polyhexes in any orientation on a planar nXnXn triangular grid. |
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+0
1
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| 1, 7, 25, 105, 639, 3603, 22857, 241966, 2928219, 43585143, 850752020, 19021431704, 530984535190
(list; graph; listen)
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OFFSET
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4,2
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EXAMPLE
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Maximal 11 X 11 X 11 example
.............1
............1.0
...........1.1.0
..........1.0.0.0
.........1.0.1.0.0
........0.0.0.1.1.0
.......1.0.0.0.1.0.1
......1.0.0.0.0.1.0.1
.....1.0.0.0.0.0.1.0.1
....1.1.0.0.0.1.0.0.1.1
...1.0.0.1.1.1.1.1.0.0.1
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CROSSREFS
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Sequence in context: A035509 A141627 A102900 this_sequence A110240 A129791 A141626
Adjacent sequences: A155268 A155269 A155270 this_sequence A155272 A155273 A155274
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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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