Number of permutations avoiding the patterns {4321, 45132, 45231, 35412, 53412, 45213, 43512, 45312, 456123, 451623, 356124}; number of strong sorting class based on 4321.
A111283
Number of permutations avoiding the patterns {4321, 45132, 45231, 35412, 53412, 45213, 43512, 45312, 456123, 451623, 356124}; number of strong sorting class based on 4321.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =23a(5) =96a(6) =409a(7) =1751a(8) =7505a(9) =32176a(10) =137956a(11) =591501a(12) =2536132a(13) =10873981a(14) =46623553a(15) =199904321a(16) =857114814a(17) =3674987126a(18) =15756967635a(19) =67559972476a(20) =289671844661
External references
- oeis: A111283