Number of set partitions of {1,2,...,n} with labeled blocks and a (possibly empty) subset of designated elements in each block.
A216794
Number of set partitions of {1,2,...,n} with labeled blocks and a (possibly empty) subset of designated elements in each block.
Terms
- a(0) =1a(1) =2a(2) =12a(3) =104a(4) =1200a(5) =17312a(6) =299712a(7) =6053504a(8) =139733760a(9) =3628677632a(10) =104701504512
External references
- oeis: A216794