Number of set partitions of [n] where sizes of distinct blocks are coprime.

A280275

Number of set partitions of [n] where sizes of distinct blocks are coprime.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =12a(5) =37a(6) =118a(7) =387a(8) =1312a(9) =4445a(10) =17034a(11) =73339a(12) =342532a(13) =1616721a(14) =7299100a(15) =31195418a(16) =129179184a(17) =578924785a(18) =3057167242a(19) =18723356715a(20) =120613872016a(21) =738703713245

External references