1,3

Also the number of (n+1)-node unlabeled rooted trees with thickening limbs and root outdegree (branching factor) 1.

In a rooted tree with thickening limbs the outdegree of a parent node is smaller than or equal to the outdegree of any of its non-leaf child nodes.

Alois P. Heinz, Table of n, a(n) for n = 1..150

a(n) = Sum_{k=0..n-1} A245151(n,k).

Row sums of A245151, also (with offset 2) column k=1 of A245151.

Sequence in context: A318185 A048816 A080528 * A334271 A206788 A002965

Adjacent sequences: A245149 A245150 A245151 * A245153 A245154 A245155

nonn

Alois P. Heinz, Jul 12 2014

approved