Number of n-bead necklaces labeled with numbers -4..4 allowing reversal, with sum zero and first differences in -4..4.
A209028
Number of n-bead necklaces labeled with numbers -4..4 allowing reversal, with sum zero and first differences in -4..4.
Terms
- a(0) =1a(1) =3a(2) =5a(3) =23a(4) =88a(5) =471a(6) =2517a(7) =14611a(8) =86014a(9) =519574a(10) =3177405a(11) =19681214a(12) =123050881a(13) =775868013a(14) =4926859869a(15) =31483531830a(16) =202298489710
External references
- oeis: A209028