Number of set partitions of [n] where the elements of each non-singleton block are pairwise coprime.

A320430

Number of set partitions of [n] where the elements of each non-singleton block are pairwise coprime.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =10a(5) =37a(6) =60a(7) =295a(8) =658a(9) =2621a(10) =5368a(11) =38535a(12) =66506a(13) =551529a(14) =1234264a(15) =5004697a(16) =13721836a(17) =143935131a(18) =256835337a(19) =2971237021a(20) =6485081140a(21) =35162930303a(22) =95872321543

External references