a(n) = (# 1's)-(# 2's) in first n terms of A030341.

Terms

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