A217814 Number of alternating permutations on 2n+1 letters that avoid a certain pattern of length 5 (see Lewis, 2012, Appendix, for precise definition).
1, 2, 16, 243, 5330, 148575, 4909608, 184302261, 7641026926
Offset: 0
Links
- J. B. Lewis, Pattern Avoidance for Alternating Permutations and Reading Words of Tableaux, Ph. D. Dissertation, Department of Mathematics, MIT, 2012.
Extensions
a(6)-a(8) from Lars Blomberg, Feb 22 2018