Abstract
A heap ordered tree with $n$ nodes ("size $n$") is a planted plane tree together with a bijection from the nodes to the set $\{1,\dots,n\}$ which is monotonically increasing when going from the root to the leaves. We consider the number of descendants of the node $j$ in a (random) heap ordered tree of size $n\ge j$. Precise expressions are derived for the probability distribution and all (factorial) moments.
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