From substitutional generation of Kolakoski sequence (A000002).

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =9a(5) =14a(6) =22a(7) =33a(8) =49a(9) =74a(10) =112a(11) =169a(12) =254a(13) =381a(14) =573a(15) =862a(16) =1292a(17) =1936a(18) =2902a(19) =4352a(20) =6525a(21) =9788a(22) =14687a(23) =22028a(24) =33050a(25) =49576a(26) =74378a(27) =111579a(28) =167387a(29) =251089