Number of n-bead necklaces labeled with numbers -7..7 not allowing reversal, with sum zero and first and second differences in -7..7.
A209006
Number of n-bead necklaces labeled with numbers -7..7 not allowing reversal, with sum zero and first and second differences in -7..7.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =38a(4) =243a(5) =1854a(6) =14701a(7) =116960a(8) =916381a(9) =7170239a(10) =56496359a(11) =449785468a(12) =3619072169
External references
- oeis: A209006