@article{spivey-2008,
  author = "Michael Z. Spivey",
  title = "A Generalized Recurrence for {Bell} Numbers",
  journal = "Journal of Integer Sequences",
  year = "2008",
  volume = "11",
  issue = "2",
  note = "Electronic copy available at https://cs.uwaterloo.ca/journals/JIS/VOL11/Spivey/spivey25.pdf"
}

@inproceedings{bell-numbers,
  title = "A000110: Bell or exponential numbers: number of ways to partition a set of n labeled elements.",
  author = "N. J. A. Sloane",
  booktitle = "The On-Line Encyclopedia of Integer Sequences",
  editors = "N. J. A. Sloane",
  note = "https://oeis.org/A000110"
}

