Counting Partitions by Genus: a Compendium of Results
Robert Coquereaux
Aix Marseille Université
Université de Toulon, CNRS, CPT
F-13284 Marseille Cedex 09
France
Jean-Bernard Zuber
Sorbonne Université, CNRS
Laboratoire de Physique Théorique et Hautes Energies, LPTHE
F-75252 Paris
France
Abstract:
We study the enumeration of set partitions, according to their length,
number of parts, cyclic type, and genus. We introduce genus-dependent
Bell, Stirling numbers, and Faà di Bruno coefficients. Besides attempting
to summarize what is already known on the subject, we obtain new generic
results (in particular for partitions into two parts, for arbitrary
genus), and present computer generated new data extending the number of
terms known for sequences or families of such coefficients; this also
leads to new conjectures.
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(Concerned with sequences
A000108
A000110
A000292
A000296
A000581
A001263
A001287
A001700
A002411
A002450
A002802
A005043
A008277
A008299
A025035
A025036
A025037
A025038
A025039
A035319
A059260
A103371
A108263
A134991
A144431
A185259
A245551
A275514
A297178
A297179
A340556.)
Received June 29 2023; revised versions received July 1 2023; January 15 2024; January 31 2024; February 2 2024; February 4 2024.
Published in Journal of Integer Sequences,
February 5 2024.
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