The number of permutations avoiding the "boxed" pattern 123.
A201168
The number of permutations avoiding the "boxed" pattern 123.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =51a(6) =194a(7) =810a(8) =3675a(9) =17935a(10) =93481a(11) =517129a(12) =3021133
External references
- oeis: A201168