Number of n-bead necklaces labeled with numbers -4..4 allowing reversal, with sum zero.
A208821
Number of n-bead necklaces labeled with numbers -4..4 allowing reversal, with sum zero.
Terms
- a(0) =1a(1) =5a(2) =13a(3) =75a(4) =415a(5) =2821a(6) =19657a(7) =144871a(8) =1090645a(9) =8392423a(10) =65527045a(11) =518173267a(12) =4139803293a(13) =33366946637
External references
- oeis: A208821