Number of n-bead necklaces labeled with numbers -4..4 not allowing reversal, with sum zero and avoiding the pattern z z+1 z+2.
A209069
Number of n-bead necklaces labeled with numbers -4..4 not allowing reversal, with sum zero and avoiding the pattern z z+1 z+2.
Terms
- a(0) =1a(1) =5a(2) =20a(3) =122a(4) =766a(5) =5239a(6) =37108a(7) =271732a(8) =2035161a(9) =15526728a(10) =120213839a(11) =942210714a(12) =7461093141a(13) =59602526850a(14) =479745735803
External references
- oeis: A209069