Number of set partitions of [n] where each subset is again partitioned into four nonempty subsets.
A327505
Number of set partitions of [n] where each subset is again partitioned into four nonempty subsets.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =0a(4) =1a(5) =10a(6) =65a(7) =350a(8) =1736a(9) =9030a(10) =60355a(11) =561550a(12) =6183221a(13) =69469400a(14) =761767370a(15) =8239194600a(16) =91058524831
External references
- oeis: A327505