Positive integers k repeated ceiling(k/3) + 1 times.

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =3a(5) =3a(6) =4a(7) =4a(8) =4a(9) =5a(10) =5a(11) =5a(12) =6a(13) =6a(14) =6a(15) =7a(16) =7a(17) =7a(18) =7a(19) =8a(20) =8a(21) =8a(22) =8a(23) =9a(24) =9a(25) =9a(26) =9a(27) =10a(28) =10a(29) =10