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A003615
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Symmetries in planted 4-trees on n+1 vertices.
(Formerly M2831)
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0
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1, 1, 3, 10, 17, 38, 106, 253, 716, 1903, 5053, 13786, 39293, 107641, 302807, 860099, 2450684, 7038472, 20316895, 58849665, 171217429, 499926666, 1464276207, 4301706250, 12671810107, 37419912977, 110759884262, 328525197554
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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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: A025395 A047702 A017017 * A043293 A178644 A128701
Adjacent sequences: A003612 A003613 A003614 * A003616 A003617 A003618
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein
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