Number of achiral color patterns (set partitions) in a row or cycle of length n with 6 or fewer colors (subsets).

A305752

Number of achiral color patterns (set partitions) in a row or cycle of length n with 6 or fewer colors (subsets).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =3a(4) =7a(5) =12a(6) =31a(7) =58a(8) =159a(9) =312a(10) =883a(11) =1774a(12) =5103a(13) =10368a(14) =30067a(15) =61414a(16) =178815a(17) =366168a(18) =1068259a(19) =2190190a(20) =6395919a(21) =13120944a(22) =38335123a(23) =78665590a(24) =229890591a(25) =471814344a(26) =1378985155a(27) =2830350526a(28) =8272839855a(29) =16980500640

External references