Length of row n of the Kolakoski fan A143477.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =6a(5) =9a(6) =13a(7) =19a(8) =29a(9) =44a(10) =66a(11) =99a(12) =151a(13) =225a(14) =338a(15) =506a(16) =761a(17) =1138a(18) =1705a(19) =2555a(20) =3835a(21) =5751a(22) =8629a(23) =12953a(24) =19426a(25) =29146a(26) =43723a(27) =65585a(28) =98351a(29) =147501