a(1) = 1, a(n+1) = 2 * digit reversal of a(n).

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =122a(6) =442a(7) =488a(8) =1768a(9) =17342a(10) =48742a(11) =49568a(12) =173188a(13) =1762742a(14) =4945342a(15) =4870988a(16) =17781568a(17) =173037542a(18) =491460742a(19) =494128388a(20) =1767642988a(21) =17784935342a(22) =48707897542a(23) =49159741568a(24) =173029590388