Triangle of T1(n,m) = number of bracelets (necklaces that can be turned over) with m white beads and (2n+1-m) black ones, for 1<=m<=n.
A078925
Triangle of T1(n,m) = number of bracelets (necklaces that can be turned over) with m white beads and (2n+1-m) black ones, for 1<=m<=n.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =1a(4) =3a(5) =4a(6) =1a(7) =4a(8) =7a(9) =10a(10) =1a(11) =5a(12) =10a(13) =20a(14) =26a(15) =1a(16) =6a(17) =14a(18) =35a(19) =57a(20) =76a(21) =1a(22) =7a(23) =19a(24) =56a(25) =111a(26) =185a(27) =232a(28) =1a(29) =8
External references
- oeis: A078925