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%I M2831 #14 Jun 21 2017 10:13:12
%S 1,1,3,10,17,38,106,253,716,1903,5053,13786,39293,107641,302807,
%T 860099,2450684,7038472,20316895,58849665,171217429,499926666,
%U 1464276207,4301706250,12671810107,37419912977,110759884262,328525197554
%N Symmetries in planted 4-trees on n+1 vertices.
%D 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.
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H Kathleen A. McKeon, <a href="/A003609/a003609.pdf">Letter to N. J. A. Sloane, July 25 1991</a>
%H Kathleen A. McKeon, <a href="/A003609/a003609_1.pdf">The expected number of symmetries in locally-restricted trees I</a>, pp. 849-860 of Y. Alavi et al., eds., Graph Theory, Combinatorics and Applications. Wiley, NY, 2 vols., 1991. [Annotated scanned copy]
%H <a href="/index/Ro#rooted">Index entries for sequences related to rooted trees</a>
%H <a href="/index/Tra#trees">Index entries for sequences related to trees</a>
%K nonn
%O 1,3
%A _N. J. A. Sloane_, _Mira Bernstein_
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