a(n) is the number of all four-color bracelets (necklaces with turning over allowed) with n beads and the four colors are from a repertoire of n distinct colors, for n >= 4.
A214312
a(n) is the number of all four-color bracelets (necklaces with turning over allowed) with n beads and the four colors are from a repertoire of n distinct colors, for n >= 4.
Terms
- a(0) =3a(1) =120a(2) =2040a(3) =21420a(4) =183330a(5) =1320480a(6) =8691480a(7) =52727400a(8) =303958710a(9) =1674472800a(10) =8928735816a(11) =46280581620a(12) =234611247780
External references
- oeis: A214312