Number of set partitions of [2n] into exactly n blocks where sizes of distinct blocks are coprime.
A280889
Number of set partitions of [2n] into exactly n blocks where sizes of distinct blocks are coprime.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =75a(4) =56a(5) =6930a(6) =28512a(7) =2849847a(8) =972400a(9) =693870606a(10) =99936200a(11) =63488350926a(12) =475814969280a(14) =497980728000
External references
- oeis: A280889