Number of achiral loops (necklaces or bracelets) of length n with integer entries that cover an initial interval of positive integers.

A327868

Number of achiral loops (necklaces or bracelets) of length n with integer entries that cover an initial interval of positive integers.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =3a(4) =8a(5) =13a(6) =44a(7) =75a(8) =308a(9) =541a(10) =2612a(11) =4683a(12) =25988a(13) =47293a(14) =296564a(15) =545835a(16) =3816548a(17) =7087261a(18) =54667412a(19) =102247563a(20) =862440068a(21) =1622632573a(22) =14857100084a(23) =28091567595a(24) =277474957988a(25) =526858348381

External references