(# 3's)-(# 4's) in first n terms of A030588.

Terms

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