Number of n-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero and first differences in -n..n.
A208985
Number of n-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero and first differences in -n..n.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =33a(4) =351a(5) =5404a(6) =104001a(7) =2416967a(8) =65820325a(9) =2058166065a(10) =72731671225
External references
- oeis: A208985