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A007136
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Number of symmetry sites in all planted 3-trees with n nodes.
(Formerly M2493)
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0
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0, 0, 0, 1, 1, 3, 5, 14, 27, 65, 142, 338, 773, 1832, 4296, 10231, 24296, 58128, 139132, 334350, 804441, 1940239, 4685806, 11335797, 27455949, 66585170, 161646826
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,6
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REFERENCES
| Bailey, C. K.; Fundamental orbits. Proceedings of the second West Coast conference on combinatorics, graph theory and computing (Eugene, Ore., 1983). Congr. Numer. 41 (1984), 149-152.
Bailey, C. K.; Palmer, E. M.; Kennedy, J. W.; Points by degree and orbit size in chemical trees. II. Discrete Appl. Math. 5 (1983), no. 2, 157-164.
R. W. Robinson, personal communication.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| Index entries for sequences related to rooted trees
Index entries for sequences related to trees
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CROSSREFS
| Sequence in context: A026667 A104208 A026777 * A145974 A147544 A192478
Adjacent sequences: A007133 A007134 A007135 * A007137 A007138 A007139
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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