Number of permutations of [n] that avoid the patterns 2-41-3, 3-14-2, 2-14-3, and 4-5-3-1-2.
A363810
Number of permutations of [n] that avoid the patterns 2-41-3, 3-14-2, 2-14-3, and 4-5-3-1-2.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =21a(5) =79a(6) =306a(7) =1196a(8) =4681a(9) =18308a(10) =71564a(11) =279820a(12) =1095533a(13) =4298463a(14) =16913428a(15) =66769536a(16) =264526329a(17) =1051845461a(18) =4197832133a(19) =16813161765a(20) =67571221016a(21) =272448598737
External references
- oeis: A363810