a(n) = n OR n^2 (applied to binary expansions).

Terms

a(0) =1a(1) =6a(2) =11a(3) =20a(4) =29a(5) =38a(6) =55a(7) =72a(8) =89a(9) =110a(10) =123a(11) =156a(12) =173a(13) =206a(14) =239a(15) =272a(16) =305a(17) =342a(18) =379a(19) =404a(20) =445a(21) =502a(22) =535a(23) =600a(24) =633a(25) =702a(26) =731a(27) =796a(28) =861a(29) =926