%I
%S 0,2,4,14,38,153,766,6259,88064,2324157
%N Total number of leaves (nodes of vertex degree 1) in all graphs of n nodes.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/TreeLeaf.html">Tree Leaf</a>
%F a(n) = Sum_{k=1..n} k*A327371(n, k).  _Andrew Howroyd_, Sep 04 2019
%Y Cf. A003227, A003228, A055541, A327371.
%K nonn,more
%O 1,2
%A _Eric W. Weisstein_
%E a(8) and a(9) from _Eric W. Weisstein_, Jun 02 2004
%E a(10) from _Andrew Howroyd_, Sep 04 2019
