Number of n-bead necklaces labeled with numbers -7..7 allowing reversal, with sum zero and first and second differences in -7..7.
A208969
Number of n-bead necklaces labeled with numbers -7..7 allowing reversal, with sum zero and first and second differences in -7..7.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =24a(4) =130a(5) =967a(6) =7425a(7) =58791a(8) =458768a(9) =3587596a(10) =28252771a(11) =224912985a(12) =1809574254
External references
- oeis: A208969