A003615 - OEIS

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A003615

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

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

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..28.

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 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