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%I #4 May 10 2013 12:44:50
%S 0,1,3,13,52,229,1024,4749,22454,108299,529896,2625903,13148268,
%T 66428383,338197609,1733399552,8936746984,46315049443,241146306914,
%U 1260805087503,6616786338256,34843842405490,184057255372576
%N Number of 2-trees rooted at an asymmetric end-edge.
%D F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 75, Eq. (3.5.4).
%Y Cf. A058870, A058866, A054581.
%K nonn
%O 1,3
%A _Vladeta Jovovic_, Aug 22 2001
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