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A003609
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Symmetries in planted (1,3) trees on 2n vertices.
(Formerly M0383)
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0
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1, 2, 2, 10, 14, 42, 90, 354, 758, 2290, 6002, 18410, 51310, 154106, 449322, 1384962, 4089174, 12475362, 37746786, 116037642, 355367310, 1097869386, 3393063162
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| 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.
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: A048153 A015623 A164124 * A179789 A102446 A192309
Adjacent sequences: A003606 A003607 A003608 * A003610 A003611 A003612
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein (mira(AT)math.berkeley.edu)
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