Guo, Bai-Ni, and Feng Qi. “An Explicit Formula for Bell Numbers in Terms of Stirling Numbers and Hypergeometric Functions”. Global Journal of Mathematical Analysis 2, no. 4 (September 8, 2014): 243–248. Accessed April 28, 2024. https://sciencepubco.com/index.php/GJMA/article/view/3310.