BIK(b)-b where b is A035082.

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =2a(5) =4a(6) =9a(7) =20a(8) =47a(9) =112a(10) =273a(11) =676a(12) =1694a(13) =4296a(14) =10991a(15) =28350a(16) =73614a(17) =192327a(18) =505093a(19) =1332801a(20) =3531598a(21) =9393501a(22) =25070735a(23) =67121670a(24) =180216260a(25) =485133376a(26) =1309101329a(27) =3540394176a(28) =9594562328a(29) =26051397890