A003614 Symmetries in unrooted (1,4) trees on 3n-1 vertices. (Formerly M2134)

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

Offset

1,1

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).

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 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

Crossrefs

Sequence in context: A152965 A345692 A139284 * A195189 A119060 A119050

Adjacent sequences: A003611 A003612 A003613 * A003615 A003616 A003617

Keyword

nonn

Author

N. J. A. Sloane, Mira Bernstein

Status

approved