Number of n-bead necklaces labeled with numbers -6..6 not allowing reversal, with sum zero and first and second differences in -6..6.
A209005
Number of n-bead necklaces labeled with numbers -6..6 not allowing reversal, with sum zero and first and second differences in -6..6.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =26a(4) =137a(5) =923a(6) =6261a(7) =43228a(8) =293991a(9) =1993292a(10) =13620471a(11) =94043892a(12) =656241875
External references
- oeis: A209005