Number of n-bead necklaces labeled with numbers -4..4 not allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.
A209111
Number of n-bead necklaces labeled with numbers -4..4 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) =5a(2) =19a(3) =120a(4) =741a(5) =5032a(6) =35253a(7) =255821a(8) =1898309a(9) =14350653a(10) =110094949a(11) =855048115a(12) =6709326541a(13) =53110380781
External references
- oeis: A209111