RATS: Reverse Add Then Sort the digits applied to previous term, starting with 3.

Terms

a(0) =3a(1) =6a(2) =12a(3) =33a(4) =66a(5) =123a(6) =444a(7) =888a(8) =1677a(9) =3489a(10) =12333a(11) =44556a(12) =111a(13) =222a(14) =444a(15) =888a(16) =1677a(17) =3489a(18) =12333a(19) =44556a(20) =111a(21) =222a(22) =444a(23) =888a(24) =1677a(25) =3489a(26) =12333a(27) =44556a(28) =111a(29) =222