Number of set partitions of [n] where each subset is again partitioned into three nonempty subsets.
A327504
Number of set partitions of [n] where each subset is again partitioned into three nonempty subsets.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =1a(4) =6a(5) =25a(6) =100a(7) =511a(8) =3626a(9) =29765a(10) =250200a(11) =2146771a(12) =19575446a(13) =195336505a(14) =2124840900a(15) =24646324431a(16) =299803782466
External references
- oeis: A327504