Number of n-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero.
A208817
Number of n-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero.
Terms
- a(0) =1a(1) =3a(2) =8a(3) =75a(4) =905a(5) =17339a(6) =417204a(7) =12322101a(8) =427919519a(9) =17112239947a(10) =774546254686
External references
- oeis: A208817