(#1's in s(1),...,s(n)) - (#1's in r(1),...,r(n)), where s = A025142 and r = A025143.

Terms

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