Number of chiral pairs of color patterns (set partitions) in a cycle of length n using 5 or fewer colors (subsets).

A320745

Number of chiral pairs of color patterns (set partitions) in a cycle of length n using 5 or fewer colors (subsets).

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =6a(6) =34a(7) =181a(8) =871a(9) =4016a(10) =18526a(11) =85101a(12) =393148a(13) =1822977a(14) =8500893a(15) =39809180a(16) =187230704a(17) =883730048a(18) =4184926222a(19) =19874478310a(20) =94629276256a(21) =451604739323

External references