Number of n-bead necklaces labeled with numbers -6..6 not allowing reversal, with sum zero and avoiding the pattern z z+1 z+2.
A209071
Number of n-bead necklaces labeled with numbers -6..6 not allowing reversal, with sum zero and avoiding the pattern z z+1 z+2.
Terms
- a(0) =1a(1) =7a(2) =42a(3) =366a(4) =3378a(5) =33469a(6) =344618a(7) =3660116a(8) =39772437a(9) =440146892a(10) =4943305065a(11) =56200679500a(12) =645543627296
External references
- oeis: A209071