a(n) = |s(n) - n|, where s = A026262.

Terms

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