%I #8 Feb 17 2018 21:12:17
%S 0,0,0,0,0,1,1,7,13,55,127,435,1110,3458,9261,27460,75305,217619,
%T 603618,1720712,4799095,13580179,37979149,107045222,299800569,
%U 843242264,2363693561,6641675073,18628827667,52325428340
%N Number of rooted trees with n nodes and omega-valency 4.
%C See A003120 for definitions.
%H J.-C. Arditti, <a href="http://dx.doi.org/10.1016/0012-365X(73)90135-0">Dénombrement des arborescences dont le graphe de comparabilité est Hamiltonien</a>, Discrete Math., 5 (1973), 189-200.
%Y Cf. A003120, A193487, A193489, A193490, A193491.
%K nonn
%O 1,8
%A _N. J. A. Sloane_, Jul 27 2011