Trajectory of 9 under map x->x + (x-with-digits-reversed).

Terms

a(0) =9a(1) =18a(2) =99a(3) =198a(4) =1089a(5) =10890a(6) =20691a(7) =40293a(8) =79497a(9) =158994a(10) =658845a(11) =1207701a(12) =2284722a(13) =4559544a(14) =9019098a(15) =17928207a(16) =88211178a(17) =175322466a(18) =839546037a(19) =1570191975a(20) =7362102726a(21) =13634115363a(22) =49985258994a(23) =99970517988a(24) =188942025987a(25) =978462275868