a(n) is the number of all three-color bracelets (necklaces with turning over allowed) with n beads and the three colors are from a repertoire of n distinct colors, for n >= 3.
A214310
a(n) is the number of all three-color bracelets (necklaces with turning over allowed) with n beads and the three colors are from a repertoire of n distinct colors, for n >= 3.
Terms
- a(0) =1a(1) =24a(2) =180a(3) =1120a(4) =5145a(5) =23016a(6) =91056a(7) =357480a(8) =1327095a(9) =4893680a(10) =17525508a(11) =62254920a(12) =217457695a(13) =753332160a(14) =2581110000a(15) =8779264032a(16) =29624681763a(17) =99350001360a(18) =331159123260
External references
- oeis: A214310