Number of n-bead necklaces labeled with numbers -6..6 not allowing reversal, with sum zero and first differences in -6..6.
A208991
Number of n-bead necklaces labeled with numbers -6..6 not allowing reversal, with sum zero and first differences in -6..6.
Terms
- a(0) =1a(1) =4a(2) =15a(3) =95a(4) =683a(5) =5404a(6) =44209a(7) =371893a(8) =3189719a(9) =27799922a(10) =245493567a(11) =2192108831a(12) =19760508059a(13) =179591215329
External references
- oeis: A208991