n appears n - 1 times.

Terms

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