Number of chiral pairs of color patterns (set partitions) in a cycle of length n using 4 or fewer colors (subsets).

A320744

Number of chiral pairs of color patterns (set partitions) in a cycle of length n using 4 or fewer colors (subsets).

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =6a(6) =30a(7) =130a(8) =532a(9) =2006a(10) =7626a(11) =28401a(12) =106260a(13) =396435a(14) =1486147a(15) =5580130a(16) =21032880a(17) =79486763a(18) =301317282a(19) =1145123672a(20) =4362804633a(21) =16658456825a(22) =63738451998a(23) =244332656201a(24) =938244497740

External references