Number of n-bead necklaces with 9 colors.

Terms

a(0) =1a(1) =9a(2) =45a(3) =249a(4) =1665a(5) =11817a(6) =88725a(7) =683289a(8) =5381685a(9) =43046889a(10) =348684381a(11) =2852823609a(12) =23535840225a(13) =195528140649