

A003614


Symmetries in unrooted (1,4) trees on 3n1 vertices.
(Formerly M2134)


0



2, 24, 72, 144, 1584, 32544, 30528, 188928, 4030848, 12029184, 66104064, 524719872, 2364433920, 28794737664, 194617138176, 962354727936, 6901447938048, 112061234884608, 366020989931520, 2592919032274944, 19913392024584192
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OFFSET

1,1


REFERENCES

Kathleen A. McKeon, The expected number of symmetries in locallyrestricted trees I, pp. 849860 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).


LINKS

Table of n, a(n) for n=1..21.
Kathleen A. McKeon, Letter to N. J. A. Sloane, July 25 1991
Kathleen A. McKeon, The expected number of symmetries in locallyrestricted trees I, pp. 849860 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


CROSSREFS

Sequence in context: A100918 A152965 A139284 * A195189 A119060 A119050
Adjacent sequences: A003611 A003612 A003613 * A003615 A003616 A003617


KEYWORD

nonn


AUTHOR

N. J. A. Sloane, Mira Bernstein


STATUS

approved



