Number of permutations of [n] that avoid the patterns 2-41-3, 3-14-2, 2-1-4-3, and 3-41-2.
A363812
Number of permutations of [n] that avoid the patterns 2-41-3, 3-14-2, 2-1-4-3, and 3-41-2.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =20a(5) =69a(6) =243a(7) =870a(8) =3159a(9) =11611a(10) =43130a(11) =161691a(12) =611065a(13) =2325739a(14) =8907360a(15) =34304298a(16) =132770564a(17) =516164832a(18) =2014739748a(19) =7892775473a(20) =31022627947a(21) =122304167437a(22) =483513636064
External references
- oeis: A363812