Number of n-bead necklaces labeled with numbers -4..4 allowing reversal, with sum zero with no three beads in a row equal.
A209340
Number of n-bead necklaces labeled with numbers -4..4 allowing reversal, with sum zero with no three beads in a row equal.
Terms
- a(0) =1a(1) =5a(2) =12a(3) =72a(4) =400a(5) =2698a(6) =18646a(7) =136000a(8) =1013342a(9) =7713270a(10) =59569974a(11) =465894736a(12) =3681136600a(13) =29342106638
External references
- oeis: A209340