Total number of 1's in binary expansions of 0, ..., n.

Terms

a(0) =0a(1) =1a(2) =2a(3) =4a(4) =5a(5) =7a(6) =9a(7) =12a(8) =13a(9) =15a(10) =17a(11) =20a(12) =22a(13) =25a(14) =28a(15) =32a(16) =33a(17) =35a(18) =37a(19) =40a(20) =42a(21) =45a(22) =48a(23) =52a(24) =54a(25) =57a(26) =60a(27) =64a(28) =67a(29) =71