Number of sequences of length n that cover an initial interval of positive integers and are both a reversed necklace and a co-necklace.
A334272
Number of sequences of length n that cover an initial interval of positive integers and are both a reversed necklace and a co-necklace.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =12a(5) =43a(6) =229a(7) =1506a(8) =12392a(9) =120443a(10) =1352943a(11) =17206943
External references
- oeis: A334272