Number of n-bead bracelets (turnover necklaces) of two colors with 10 red beads and n-10 black beads.
A005515
Number of n-bead bracelets (turnover necklaces) of two colors with 10 red beads and n-10 black beads.
Terms
- a(0) =1a(1) =1a(2) =6a(3) =14a(4) =47a(5) =111a(6) =280a(7) =600a(8) =1282a(9) =2494a(10) =4752a(11) =8524a(12) =14938a(13) =25102a(14) =41272a(15) =65772a(16) =102817a(17) =156871a(18) =235378a(19) =346346a(20) =502303a(21) =716859a(22) =1010256a(23) =1404624a(24) =1931540a(25) =2625658a(26) =3534776a(27) =4711448a(28) =6226148a(29) =8156396
External references
- oeis: A005515