a(n) = |s(n) - n|, where s = A026234.

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) =5a(12) =3a(13) =5a(14) =8a(15) =13a(16) =5a(17) =13a(18) =5a(19) =17a(20) =20a(21) =21a(22) =8a(23) =23a(24) =28a(25) =33a(26) =34a(27) =39a(28) =13a(29) =41