a(1) = 1 and for any n > 1, a(n) = A321485(a(n-1)).

Terms

a(0) =1a(1) =11a(2) =21a(3) =121a(4) =1121a(5) =21121a(6) =121121a(7) =2121a(8) =221a(9) =2211a(10) =2221a(11) =3211a(12) =13211a(13) =113211a(14) =2113211a(15) =12113211a(16) =112113211a(17) =2112113211a(18) =221113211a(19) =223113211a(20) =2213113211a(21) =22113113211a(22) =2221131211a(23) =3221131211a(24) =13221131211a(25) =113221131211