Number of finite sets of set partitions of {1,...,n} such that any two have meet {{1},...,{n}} and join {{1,...,n}}.
A318532
Number of finite sets of set partitions of {1,...,n} such that any two have meet {{1},...,{n}} and join {{1,...,n}}.
Terms
- a(0) =2a(1) =4a(2) =11a(3) =51a(4) =635a(5) =15591
External references
- oeis: A318532