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%I #4 May 10 2013 12:44:50
%S 1,1,1,2,3,6,10,21,38,84,156,352,677,1562,3054,7148,14196,33603,67474,
%T 161121,326519,785305,1603111,3878194,7965845,19365811,39983300,
%U 97610247,202424674,495955345,1032460679,2537529717,5300256499
%N Number of 2-trees rooted at any symmetric edge.
%D F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 75, Eq. (3.5.9).
%Y Cf. A058870, A058866, A054581.
%K nonn
%O 0,4
%A _Vladeta Jovovic_, Aug 22 2001
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