Number of n-bead necklaces labeled with numbers -7..7 not allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.
A209114
Number of n-bead necklaces labeled with numbers -7..7 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) =8a(2) =55a(3) =559a(4) =5935a(5) =67681a(6) =802125a(7) =9804610a(8) =122616851a(9) =1561658960a(10) =20184817925a(11) =264098109360
External references
- oeis: A209114