Number of alternating permutations on 2n+1 letters that avoid a certain pattern of length 5 (see Lewis, 2012, Appendix, for precise definition).
A217815
Number of alternating permutations on 2n+1 letters that avoid a certain pattern of length 5 (see Lewis, 2012, Appendix, for precise definition).
Terms
- a(0) =1a(1) =2a(2) =16a(3) =243a(4) =5330a(5) =148764a(6) =4937012a(7) =186936427a(8) =7857183636
External references
- oeis: A217815