Number of permutations of [n] that avoid the patterns 2-41-3, 3-14-2, and 2-1-3-5-4.
A363809
Number of permutations of [n] that avoid the patterns 2-41-3, 3-14-2, and 2-1-3-5-4.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =22a(5) =89a(6) =378a(7) =1647a(8) =7286a(9) =32574a(10) =146866a(11) =667088a(12) =3050619a(13) =14039075a(14) =64992280a(15) =302546718a(16) =1415691181a(17) =6656285609a(18) =31436228056a(19) =149079962872a(20) =709680131574
External references
- oeis: A363809