Number of n-bead necklaces labeled with numbers -6..6 allowing reversal, with sum zero and first and second differences in -6..6.
A208968
Number of n-bead necklaces labeled with numbers -6..6 allowing reversal, with sum zero and first and second differences in -6..6.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =18a(4) =77a(5) =495a(6) =3186a(7) =21830a(8) =147381a(9) =998124a(10) =6812903a(11) =47032427a(12) =328140226
External references
- oeis: A208968