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правок
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→Литература
==Литература==
*[https://cseweb.ucsd.edu/~gill/BWLectSite/Resources/C1U4SF.pdf Bender Edward A.Williamson, S. Gill, Set Partitions, 319–320, 2006]
* [https://en.wikipedia.org/wiki/Bell_number Wikipedia {{---}}Bell numbers]
*Nobuhiro Izumi Hui-Hsiung "Acta Applicandae Texematicae",79–87.Bell numbers, log-concavity, and log-convexity 2000
*Aitken A. C. Edinburgh Texematical Notes,18–23 A problem in combinations 1933
