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

A280881

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

Terms

    a(0) =1a(1) =6a(2) =10a(3) =75a(4) =21a(5) =476a(6) =540a(7) =4185a(8) =1375a(9) =47850a(10) =10374a(11) =249431a(12) =395955a(13) =2572680a(14) =278392a(15) =30877389a(16) =5000211a(17) =214159070a(18) =291693150a(19) =1465649955a(20) =1224138223a(21) =23284864476a(22) =13175039700a(23) =157019230225a(24) =198060711381

External references