Number of permutations of [n] avoiding the pattern 124-3.
A200403
Number of permutations of [n] avoiding the pattern 124-3.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =23a(4) =107a(5) =584a(6) =3660a(7) =25910a(8) =204564a(9) =1782520a(10) =16995202a(11) =176008542a(12) =1967664910a(13) =23618071616a(14) =302957562470
External references
- oeis: A200403