a(n) = (# 1's)-(# 2's) in first n terms of A030401.

Terms

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