Recurrence Relations and Two-Dimensional Set Partitions
Toufik Mansour
Department of Mathematics
University of Haifa 
31905 Haifa, Israel
Augustine Munagi
John Knopfmacher Centre for Applicable Analysis and Number Theory 
School of Mathematics
University of the Witwatersrand 
Johannesburg, South Africa
Mark Shattuck
Department of Mathematics
University of Tennessee 
Knoxville, TN 37996
USA 
Abstract:
In this paper, we consider a two-dimensional model for finite set
partitions which arises in conjunction with a special case of a general
non-linear recurrence.  We investigate properties of some of the
related counting sequences, including recurrences and generating
functions.  In particular, we obtain, by combinatorial arguments, some
formulas relating these sequences to the Stirling numbers of the first
kind.  Specializing these arguments yields bijective proofs of some
recent identities of Gould and Quaintance involving the Bell numbers,
which were established using algebraic methods.
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(Concerned with sequences
A000110
A000258
A008275 
A008277.)
Received November 4 2010;
revised version received March 14 2011.
Published in Journal of Integer Sequences, March 26 2011.
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