Number of compositions of n that are both a reversed necklace and a co-necklace.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =7a(6) =12a(7) =17a(8) =28a(9) =43a(10) =70a(11) =111a(12) =184a(13) =303a(14) =510a(15) =865a(16) =1482a(17) =2573a(18) =4480a(19) =7915a(20) =14008a(21) =25055a(22) =44954a(23) =81299a(24) =147356a(25) =268959a(26) =492050a(27) =904637a(28) =1667604a(29) =3085951