Number of n-bead necklaces labeled with numbers -5..5 not allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.
A209112
Number of n-bead necklaces labeled with numbers -5..5 not 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) =6a(2) =29a(3) =221a(4) =1683a(5) =14037a(6) =121117a(7) =1079992a(8) =9849223a(9) =91488850a(10) =862442967a(11) =8230097726a(12) =79348933361
External references
- oeis: A209112