Trajectory of 19 under map x->x + (x-with-digits-reversed).

Terms

a(0) =19a(1) =110a(2) =121a(3) =242a(4) =484a(5) =968a(6) =1837a(7) =9218a(8) =17347a(9) =91718a(10) =173437a(11) =907808a(12) =1716517a(13) =8872688a(14) =17735476a(15) =85189247a(16) =159487405a(17) =664272356a(18) =1317544822a(19) =3602001953a(20) =7193004016a(21) =13297007933a(22) =47267087164