Triangle read by rows: T(n,k) is the number of n-bead necklaces using exactly k colors with no adjacent beads having the same color.

A330618

Triangle read by rows: T(n,k) is the number of n-bead necklaces using exactly k colors with no adjacent beads having the same color.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =0a(4) =0a(5) =2a(6) =0a(7) =1a(8) =3a(9) =6a(10) =0a(11) =0a(12) =6a(13) =24a(14) =24a(15) =0a(16) =1a(17) =11a(18) =80a(19) =180a(20) =120a(21) =0a(22) =0a(23) =18a(24) =240a(25) =960a(26) =1440a(27) =720a(28) =0a(29) =1

External references