Number of black and white n-bead necklaces with at least 3 white beads (turning over is not allowed); also number of clockwise arrangements of reflex and non-reflex angles that can form an n-gon.
A262232
Number of black and white n-bead necklaces with at least 3 white beads (turning over is not allowed); also number of clockwise arrangements of reflex and non-reflex angles that can form an n-gon.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =2a(5) =4a(6) =9a(7) =15a(8) =30a(9) =54a(10) =101a(11) =181a(12) =344a(13) =624a(14) =1173a(15) =2183a(16) =4106a(17) =7702a(18) =14591a(19) =27585a(20) =52476a(21) =99868a(22) =190733a(23) =364711a(24) =699238a(25) =1342170a(26) =2581413a(27) =4971053a(28) =9587564a(29) =18512776
External references
- oeis: A262232