Number of n-bead necklaces labeled with numbers -3..3 allowing reversal, with sum zero with no three beads in a row equal.
A209339
Number of n-bead necklaces labeled with numbers -3..3 allowing reversal, with sum zero with no three beads in a row equal.
Terms
- a(0) =1a(1) =4a(2) =7a(3) =35a(4) =145a(5) =770a(6) =4029a(7) =22739a(8) =130282a(9) =766177a(10) =4566523a(11) =27587850a(12) =168340643a(13) =1036444786a(14) =6429150260a(15) =40144480583
External references
- oeis: A209339