Squares using only decimal digits 0,1,2,3.

Terms

a(0) =0a(1) =1a(2) =100a(3) =121a(4) =10000a(5) =10201a(6) =12100a(7) =12321a(8) =22201a(9) =123201a(10) =130321a(11) =1000000a(12) =1002001a(13) =1020100a(14) =1022121a(15) =1210000a(16) =1212201a(17) =1232100a(18) =1320201a(19) =2220100a(20) =3101121a(21) =12320100a(22) =13032100a(23) =100000000a(24) =100020001a(25) =100200100a(26) =100220121a(27) =102010000a(28) =102030201a(29) =102212100