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

A320645

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

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =4a(7) =51a(8) =339a(9) =2010a(10) =10900a(11) =56700a(12) =286888a(13) =1426542a(14) =7014746a(15) =34229050a(16) =166197824a(17) =804243285a(18) =3883608940a(19) =18729354638a(20) =90266471623a(21) =434946282498

External references