Number of n-bead necklaces labeled with numbers -3..3 not allowing reversal, with sum zero and first differences in -3..3.
A208988
Number of n-bead necklaces labeled with numbers -3..3 not allowing reversal, with sum zero and first differences in -3..3.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =16a(4) =59a(5) =253a(6) =1111a(7) =5067a(8) =23483a(9) =110772a(10) =529201a(11) =2557073a(12) =12471501a(13) =61328336a(14) =303723367a(15) =1513583006a(16) =7584498891a(17) =38192683192a(18) =193171464383a(19) =980903632155
External references
- oeis: A208988