%I A003612 M0371
%S A003612 1,2,2,8,4,14,21,35,49,158,191,425,828,1864,3659,8324,17344,39601,87407,
%T A003612 199984,453361,1053816,2426228,5672389,13270695,31277150,73874375,
%U A003612 175419550,417535487,997758788,2390172398,5743235470,13832781125
%N A003612 Symmetries in unrooted 3-trees on n+1 vertices.
%D A003612 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A003612 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.
%H A003612 <a href="Sindx_Tra.html#trees">Index entries for sequences related to 
               trees</a>
%Y A003612 Sequence in context: A134812 A144847 A143625 this_sequence A103839 A135727 
               A075101
%Y A003612 Adjacent sequences: A003609 A003610 A003611 this_sequence A003613 A003614 
               A003615
%K A003612 nonn
%O A003612 1,2
%A A003612 N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein (mira(AT)math.berkeley.edu)