A003611 - OEIS

%I M2359 #14 Jun 21 2017 10:11:40

%S 1,1,3,4,9,16,41,78,179,382,889,1992,4648,10749,25462,59891,142793,

%T 340761,819533,1975109,4784055,11617982,28316757,69185852,169516558,

%U 416268547,1024543728,2526631078,6242969248,15452300967,38310417739

%N Symmetries in planted 3-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_