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Number of 3-bead necklaces where each bead is an unlabeled rooted tree, by total number of nodes.
0

%I #6 Jul 11 2015 00:13:34

%S 1,1,2,4,8,18,43,103,255,642,1640,4242,11096,29278,77882,208589,

%T 562056,1522606,4144521,11329608,31090910,85618848,236530942,

%U 655344579,1820585313,5070138554,14151907583,39584395796,110938500821,311481097178

%N Number of 3-bead necklaces where each bead is an unlabeled rooted tree, by total number of nodes.

%Y See A058855 (the 6-bead analog) for details.

%K nonn

%O 0,3

%A _N. J. A. Sloane_, Jan 18 2001