Number of n-bead necklaces labeled with numbers -7..7 not allowing reversal, with sum zero and first differences in -7..7.
A208992
Number of n-bead necklaces labeled with numbers -7..7 not allowing reversal, with sum zero and first differences in -7..7.
Terms
- a(0) =1a(1) =4a(2) =19a(3) =144a(4) =1207a(5) =11010a(6) =104001a(7) =1008880a(8) =9979817a(9) =100308712a(10) =1021569027a(11) =10520123630a(12) =109367955653
External references
- oeis: A208992