Number of n-bead necklaces labeled with numbers -6..6 allowing reversal, with sum zero with no three beads in a row equal.
A209342
Number of n-bead necklaces labeled with numbers -6..6 allowing reversal, with sum zero with no three beads in a row equal.
Terms
- a(0) =1a(1) =7a(2) =24a(3) =205a(4) =1724a(5) =16968a(6) =172610a(7) =1830872a(8) =19860306a(9) =219630346a(10) =2464760150a(11) =28002352120
External references
- oeis: A209342