Combinatorics of geometrically distributed random variables: New -tangent and -secant numbers.
Enumeration problems of trees. (Abzählprobleme bei Bäumen.)
On a functional-difference equation of Runyon, Morrison, Carlitz, and Riordan.
Epidemics with two levels of mixing: The exact moments.
On binary representations of integers with digits .
Combinatorial problems related to geometrically distributed random variables.
Descendants in heap ordered trees or a triumph of computer algebra.
A note on the distribution of the three types of nodes in uniform binary trees.
A continued fraction expansion for a -tangent function: an elementary proof.
Human proofs of identities by Osburn and Schneider.
The kernel method: a collection of examples.
Two -identities from the theory of fountains and histograms proved with a tri-diagonal determinant.
Generating functions related to partition formulæ for Fibonacci numbers.
On the expansion of Fibonacci and Lucas polynomials.
The height of -binary search trees.
Fountains, histograms, and -identitie.
The number of inversions in permutations: A saddle point approach.
A simple card guessing game revisited.
Kirkman's hypothesis revisited.
Descendants and ascendants in binary trees.
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