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Search: id:A003611
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| A003611 |
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Symmetries in planted 3-trees on n+1 vertices.
(Formerly M2359)
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+0
1
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| 1, 1, 3, 4, 9, 16, 41, 78, 179, 382, 889, 1992, 4648, 10749, 25462, 59891, 142793, 340761, 819533, 1975109, 4784055, 11617982, 28316757, 69185852, 169516558, 416268547, 1024543728, 2526631078, 6242969248, 15452300967, 38310417739
(list; graph; listen)
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OFFSET
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1,3
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Kathleen A. McKeon, The expected number of symmetries in locally-restricted trees I, pp. 849-860 of Y. Alavi et al., eds., Graph Theory, Combinatorics and Applications. Wiley, NY, 2 vols., 1991.
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LINKS
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Index entries for sequences related to rooted trees
Index entries for sequences related to trees
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CROSSREFS
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Sequence in context: A054188 A093368 A095095 this_sequence A103295 A028344 A078010
Adjacent sequences: A003608 A003609 A003610 this_sequence A003612 A003613 A003614
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein (mira(AT)math.berkeley.edu)
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