Number of permutations of [n] avoiding the pattern 12-3-4.
A200406
Number of permutations of [n] avoiding the pattern 12-3-4.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =23a(4) =105a(5) =550a(6) =3228a(7) =20878a(8) =146994a(9) =1116000a(10) =9068288a(11) =78384726a(12) =717102126a(13) =6913783826a(14) =69991576572
External references
- oeis: A200406