Number of achiral color patterns (set partitions) for a row or loop of length n using exactly 5 colors (sets).

A304975

Number of achiral color patterns (set partitions) for a row or loop of length n using exactly 5 colors (sets).

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =1a(6) =3a(7) =12a(8) =34a(9) =95a(10) =261a(11) =630a(12) =1700a(13) =3801a(14) =10143a(15) =21672a(16) =57414a(17) =119155a(18) =314121a(19) =639210a(20) =1679320a(21) =3370301a(22) =8832483a(23) =17549532a(24) =45907994a(25) =90541815a(26) =236526381a(27) =463889790a(28) =1210585740a(29) =2364180001

External references