Number of n-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero and first and second differences in -n..n.
A208962
Number of n-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero and first and second differences in -n..n.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =8a(4) =40a(5) =495a(6) =7425a(7) =140429a(8) =3014206a(9) =73238115a(10) =2000005946
External references
- oeis: A208962