Squares composed of digits {2,4,9}.

Terms

a(0) =4a(1) =9a(2) =49a(3) =29929a(4) =44944a(5) =94249a(6) =2424249a(7) =9229444a(8) =22924944a(9) =42994249a(10) =92294449a(11) =4924249929a(12) =49429294929a(13) =422224444944