(# 4's)-(# 5's) in first n terms of A030604.

Terms

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