Number of n-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero and avoiding the pattern z z+1 z+2.
A209065
Number of n-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero and avoiding the pattern z z+1 z+2.
Terms
- a(0) =1a(1) =3a(2) =12a(3) =122a(4) =1722a(5) =33469a(6) =817594a(7) =24194286a(8) =841661871a(9) =33691654098
External references
- oeis: A209065