Изменения
→Источники
<references/>
==Источникиинформации==
*[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]
