Number of n-bead necklaces labeled with numbers -3..3 not allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.
A209110
Number of n-bead necklaces labeled with numbers -3..3 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) =4a(2) =11a(3) =55a(4) =261a(5) =1373a(6) =7377a(7) =41256a(8) =235639a(9) =1372782a(10) =8114465a(11) =48564722a(12) =293656843a(13) =1791382922a(14) =11011083783a(15) =68131049950a(16) =424018776003
External references
- oeis: A209110