Number of achiral color patterns (set partitions) for a row or loop of length n using exactly 6 colors (sets).

A304976

Number of achiral color patterns (set partitions) for a row or loop of length n using exactly 6 colors (sets).

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =1a(7) =3a(8) =18a(9) =46a(10) =195a(11) =461a(12) =1696a(13) =3836a(14) =13097a(15) =28819a(16) =94094a(17) =203322a(18) =644911a(19) =1376217a(20) =4279692a(21) =9051592a(22) =27755013a(23) =58319855a(24) =176992090a(25) =370087718a(26) =1114496747a(27) =2321721493a(28) =6950406008a(29) =14437363668

External references