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Search: id:A003612
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| A003612 |
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Symmetries in unrooted 3-trees on n+1 vertices.
(Formerly M0371)
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+0
1
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| 1, 2, 2, 8, 4, 14, 21, 35, 49, 158, 191, 425, 828, 1864, 3659, 8324, 17344, 39601, 87407, 199984, 453361, 1053816, 2426228, 5672389, 13270695, 31277150, 73874375, 175419550, 417535487, 997758788, 2390172398, 5743235470, 13832781125
(list; graph; listen)
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OFFSET
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1,2
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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 trees
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CROSSREFS
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Sequence in context: A134812 A144847 A143625 this_sequence A103839 A135727 A075101
Adjacent sequences: A003609 A003610 A003611 this_sequence A003613 A003614 A003615
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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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