Number of n-bead necklaces labeled with numbers -6..6 allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.
A209483
Number of n-bead necklaces labeled with numbers -6..6 allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.
Terms
- a(0) =1a(1) =7a(2) =24a(3) =205a(4) =1702a(5) =16660a(6) =168453a(7) =1778878a(8) =19211780a(9) =211576925a(10) =2364602172a(11) =26755001917
External references
- oeis: A209483