Number of cyclic patterns of length n that avoid the vincular pattern 23-4-1.
A346661
Number of cyclic patterns of length n that avoid the vincular pattern 23-4-1.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =50a(6) =180a(7) =690a(8) =2792a(9) =11857a(10) =52633a(11) =243455a(12) =1170525a(13) =5837934a(14) =30151474a(15) =161021581a(16) =888001485a(17) =5051014786a(18) =29600662480a(19) =178541105770
External references
- oeis: A346661