

A003615


Symmetries in planted 4trees on n+1 vertices.
(Formerly M2831)


0



1, 1, 3, 10, 17, 38, 106, 253, 716, 1903, 5053, 13786, 39293, 107641, 302807, 860099, 2450684, 7038472, 20316895, 58849665, 171217429, 499926666, 1464276207, 4301706250, 12671810107, 37419912977, 110759884262, 328525197554
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OFFSET

1,3


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..28.
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 rooted trees
Index entries for sequences related to trees


CROSSREFS

Sequence in context: A273235 A334964 A309351 * A043293 A208894 A178644
Adjacent sequences: A003612 A003613 A003614 * A003616 A003617 A003618


KEYWORD

nonn


AUTHOR

N. J. A. Sloane, Mira Bernstein


STATUS

approved



