Number of necklaces with 6 black beads and n-6 white beads.

Terms

a(0) =1a(1) =1a(2) =4a(3) =10a(4) =22a(5) =42a(6) =80a(7) =132a(8) =217a(9) =335a(10) =504a(11) =728a(12) =1038a(13) =1428a(14) =1944a(15) =2586a(16) =3399a(17) =4389a(18) =5620a(19) =7084a(20) =8866a(21) =10966a(22) =13468a(23) =16380a(24) =19811a(25) =23751a(26) =28336a(27) =33566a(28) =39576a(29) =46376