ATS: Add Then Sort (i.e., double previous term and then sort digits).

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =23a(6) =46a(7) =29a(8) =58a(9) =116a(10) =223a(11) =446a(12) =289a(13) =578a(14) =1156a(15) =1223a(16) =2446a(17) =2489a(18) =4789a(19) =5789a(20) =11578a(21) =12356a(22) =12247a(23) =24449a(24) =48889a(25) =77789a(26) =155578a(27) =111356a(28) =122227a(29) =244445