Number of permutations of length n which avoid the patterns 1432, 2143, 3124; or avoid the patterns 1432, 2314, 3142.
A116793
Number of permutations of length n which avoid the patterns 1432, 2143, 3124; or avoid the patterns 1432, 2314, 3142.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =21a(4) =74a(5) =253a(6) =845a(7) =2791a(8) =9188a(9) =30246a(10) =99639a(11) =328422a(12) =1082797a(13) =3570197a(14) =11771589a(15) =38812310a(16) =127966990a(17) =421913905a(18) =1391070390a(19) =4586427029a(20) =15121681789a(21) =49856965951a(22) =164381014292a(23) =541972783322
External references
- oeis: A116793