Reversed shortest (x+1,2x)-code of n.

Terms

a(0) =1a(1) =2a(2) =12a(3) =22a(4) =122a(5) =212a(6) =1212a(7) =222a(8) =1222a(9) =2122a(10) =12122a(11) =2212a(12) =12212a(13) =21212a(14) =121212a(15) =2222a(16) =12222a(17) =21222a(18) =121222a(19) =22122a(20) =122122a(21) =212122a(22) =1212122a(23) =22212a(24) =122212a(25) =212212a(26) =1212212a(27) =221212a(28) =1221212a(29) =2121212