Number of 1's in n-th "Kolakoski" string defined in A054349.

Terms

a(0) =0a(1) =0a(2) =2a(3) =3a(4) =4a(5) =6a(6) =11a(7) =17a(8) =24a(9) =36a(10) =55a(11) =84a(12) =127a(13) =189a(14) =284a(15) =432a(16) =648a(17) =970a(18) =1452a(19) =2179a(20) =3262a(21) =4889a(22) =7346a(23) =11006a(24) =16524a(25) =24774a(26) =37177a(27) =55771a(28) =83685a(29) =125548