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Symmetries in unrooted 3-trees on n+1 vertices.
(Formerly M0371)
0

%I M0371 #12 Jun 21 2017 10:11:59

%S 1,2,2,8,4,14,21,35,49,158,191,425,828,1864,3659,8324,17344,39601,

%T 87407,199984,453361,1053816,2426228,5672389,13270695,31277150,

%U 73874375,175419550,417535487,997758788,2390172398,5743235470,13832781125

%N Symmetries in unrooted 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/Tra#trees">Index entries for sequences related to trees</a>

%K nonn

%O 1,2

%A _N. J. A. Sloane_, _Mira Bernstein_