Related to number of mesh patterns of length 2 that avoid the pattern 321.
A289654
Related to number of mesh patterns of length 2 that avoid the pattern 321.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =3a(4) =13a(5) =40a(6) =130a(7) =427a(8) =1428a(9) =4860a(10) =16794
External references
- oeis: A289654