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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, 4261678656, 12615722288, 37914214232, 113567513528, 343641240328, 1039134670952
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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REFERENCES
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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
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Table of n, a(n) for n=1..30.
Kathleen A. McKeon, Letter to N. J. A. Sloane, July 25 1991
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. [Annotated scanned copy]
Index entries for sequences related to trees
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CROSSREFS
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Sequence in context: A328910 A064165 A320573 * A201776 A206476 A077477
Adjacent sequences: A003607 A003608 A003609 * A003611 A003612 A003613
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane, Mira Bernstein
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EXTENSIONS
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More terms from Sean A. Irvine, Feb 24 2019
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STATUS
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approved
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