Generalized Near-Bell Numbers
Martin Griffiths
Department of Mathematical Sciences
University of Essex
Wivenhoe Park
Colchester
CO4 3SQ
United Kingdom
Abstract:
The $n$th near-Bell number, as defined by Beck, enumerates all possible
partitions of an n-multiset with multiplicities 1,1,1,...,1,2.
In this paper we study the sequences arising from a generalization of
the near-Bell numbers, and provide a method for obtaining both their
exponential and their ordinary generating functions. We derive various
interesting relationships amongst both the generating functions and the
sequences, and then show how to extend these results to deal with more
general multisets.
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(Concerned with sequences
A000110 and
A035098.)
Received April 27 2009;
revised version received July 14 2009.
Published in Journal of Integer Sequences, July 16 2009.
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