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

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =8a(6) =16a(7) =23a(8) =40a(9) =62a(10) =110a(11) =169a(12) =302a(13) =492a(14) =856a(15) =1454a(16) =2572a(17) =4428a(18) =7914a(19) =13935a(20) =25036a(21) =44842a(22) =81298a(23) =147149a(24) =268952a(25) =491746a(26) =904594a(27) =1667091a(28) =3085950a(29) =5723367