Number of (4,2)-noncrossing partitions of [n].
A140980
Number of (4,2)-noncrossing partitions of [n].
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =52a(6) =202a(7) =856a(8) =3868a(9) =18313a(10) =89711a(11) =450825a(12) =2310453
External references
- oeis: A140980