First differences of A033485; also A033485 with terms repeated.

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =3a(5) =3a(6) =5a(7) =5a(8) =7a(9) =7a(10) =10a(11) =10a(12) =13a(13) =13a(14) =18a(15) =18a(16) =23a(17) =23a(18) =30a(19) =30a(20) =37a(21) =37a(22) =47a(23) =47a(24) =57a(25) =57a(26) =70a(27) =70a(28) =83a(29) =83