Squares composed of digits {4,8,9}.

Terms

a(0) =4a(1) =9a(2) =49a(3) =484a(4) =4489a(5) =44944a(6) =444889a(7) =499849a(8) =44448889a(9) =449948944a(10) =4444488889a(11) =444444888889a(12) =949488489889