Number of non-double-crossing set partitions of {1,...,n}.
A306551
Number of non-double-crossing set partitions of {1,...,n}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =52a(6) =202a(7) =863a(8) =3999a(9) =19880a(10) =105134a(11) =587479a(12) =3449505
External references
- oeis: A306551