Number of chiral pairs of color patterns (set partitions) in a cycle of length n using exactly 6 colors (subsets).

A320646

Number of chiral pairs of color patterns (set partitions) in a cycle of length n using exactly 6 colors (subsets).

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =9a(8) =125a(9) =1054a(10) =7928a(11) =54383a(12) =356594a(13) =2259504a(14) =14008733a(15) =85422360a(16) =514773336a(17) =3074341497a(18) =18238301412a(19) =107649939612a(20) =632987843336

External references