The number of skew sum indecomposable permutations which avoid the patterns 3124 and 4312.
A228771
The number of skew sum indecomposable permutations which avoid the patterns 3124 and 4312.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =12a(4) =53a(5) =234a(6) =1013a(7) =4306a(8) =18051a(9) =74903a(10) =308487a(11) =1263393a(12) =5152139a(13) =20941298a(14) =84897207a(15) =343467388a(16) =1387244237a(17) =5595368133a(18) =22543241377a(19) =90739796783a(20) =364954106877
External references
- oeis: A228771