Number of 1's minus number of 0's in first n terms of A030317.

Terms

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