(# 1's)-(# 0's) in first n terms of A030302.

Terms

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