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A003610
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Symmetries in unrooted (1,3) trees on 2n vertices.
(Formerly M1565)
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0
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2, 6, 8, 8, 56, 24, 168, 240, 608, 920, 5680, 6104, 18416, 43008, 148152, 325608, 980840, 2421096, 7336488, 19769312, 58192608, 164776248, 502085760, 1427051544
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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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 trees
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CROSSREFS
| Sequence in context: A093888 A136702 A064165 * A201776 A077477 A095879
Adjacent sequences: A003607 A003608 A003609 * A003611 A003612 A003613
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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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