Triangle read by rows: T(n,k) is the number of n-bead necklaces with exactly k different colored beads.

A087854

Triangle read by rows: T(n,k) is the number of n-bead necklaces with exactly k different colored beads.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =2a(6) =1a(7) =4a(8) =9a(9) =6a(10) =1a(11) =6a(12) =30a(13) =48a(14) =24a(15) =1a(16) =12a(17) =91a(18) =260a(19) =300a(20) =120a(21) =1a(22) =18a(23) =258a(24) =1200a(25) =2400a(26) =2160a(27) =720a(28) =1a(29) =34

External references