Enumeration of 2-Wilf Classes of Four 4-letter Patterns

David Callan, Toufik Mansour

Research output: Contribution to journalArticlepeer-review


Let Sn be the symmetric group of all permutations of n letters. We show that there are precisely 64 Wilf classes consisting of exactly 2 symmetry classes of subsets of four 4-letter patterns.
Original languageEnglish
Pages (from-to)210-225
Number of pages16
JournalTurkish Journal of Analysis and Number Theory
Issue number6
StatePublished - 2017


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