(# 1's)-(# 2's) in first n terms of A030363.

Terms

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