Number of necklaces with 10 black beads and n-10 white beads.

Terms

a(0) =1a(1) =1a(2) =6a(3) =22a(4) =73a(5) =201a(6) =504a(7) =1144a(8) =2438a(9) =4862a(10) =9252a(11) =16796a(12) =29414a(13) =49742a(14) =81752a(15) =130752a(16) =204347a(17) =312455a(18) =468754a(19) =690690a(20) =1001603a(21) =1430715a(22) =2016144a(23) =2804880a(24) =3856892a(25) =5245128a(26) =7060984a(27) =9414328a(28) =12440668a(29) =16301164