David Callan

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A combinatorial survey of identities for the double factorial

David Callan, David Callan, 2009, 0906.1317.

A bijection to count (1-23-4)-avoiding permutations

David Callan, David Callan, 2010 .

A Sum of Chebyshev Inequalities: 10687

O. P. Lossers, David Callan, Robin J. Chapman, 2000, Am. Math. Mon..

Research problem: Elementary divisors of an inversion-counting matrix

David Callan, 1995 .

Priority queues and the Bruhat order

David Callan, 2012 .

Sets, Lists and Noncrossing Partitions

David Callan, David Callan, 2007, 0711.4841.

On conjugates for set partitions and integer compositions

David Callan, 2005, math/0508052.

Restricted ascent sequences and Catalan numbers

T. Mansour, M. Shattuck, David Callan, 2014, 1403.6933.

On Generating Functions Involving the Square Root of a Quadratic Polynomial

David Callan, 2007 .

Oddly Triangulated Polygons: 11298 [2007, 547]

David Callan, Jakob Jonsson, Annie Carter, 2009, Am. Math. Mon..

A Note on Generalized Narayana Numbers

David Callan, 2022, 2205.08277.

On conjugates for set partitions and integer compositions

David Callan, 2005, math/0508052.

A Combinatorial Interpretation of j/n {kn}\choose{n+j}

David Callan, 2006, math/0604471.

Some identities for the Catalan and Fine numbers

David Callan, 2005, math/0502532.

Circular Digraph Walks, k-Balanced Strings, Lattice Paths and Chebychev Polynomials

David Callan, Qing-Hu Hou, Evangelos Georgiadis, 2008, Electron. J. Comb..

A Determinant of Stirling Cycle Numbers Counts Unlabeled Acyclic Single-Source Automata

David Callan, David Callan, 2007, Discret. Math. Theor. Comput. Sci..

On evaluating permanents and a matrix of contangents

David Callan, 1995 .

On conjugates for integer compositions and set partitions

David Callan, 2005 .

Pair Them Up! A Visual Approach to the Chung-Feller Theorem

David Callan, David Callan, 1995 .

Pattern avoidance in circular permutations

David Callan, 2002, math/0210014.

A Combinatorial Interpretation for an Identity of Barrucand

David Callan, David Callan, 2008 .

Enumeration of small Wilf classes avoiding 1342 and two other 4-letter patterns

T. Mansour, David Callan, 2017, Pure Mathematics and Applications.

A Bijection on Dyck Paths and its Cycle Structure

David Callan, David Callan, 2006, Electron. J. Comb..

Pattern avoidance in "flattened" partitions

David Callan, David Callan, 2008, Discret. Math..

Another Description of the Central Delannoy Numbers: 10894

David Callan, Robert A. Sulanke, Nelson Castañeda, 2003, Am. Math. Mon..

Rogers-Ramanujan Partitions: 10627

David Callan, George E. Andrews, Robin J. Chapman, 2000, The American mathematical monthly.

A combinatorial derivation of the number of labeled forests

David Callan, 2003, math/0311259.