Squares composed of digits {2,4,6}.

Terms

a(0) =4a(1) =64a(2) =4624a(3) =26244a(4) =446224a(5) =26646244a(6) =44462224a(7) =662444644a(8) =4444622224a(9) =6266622244a(10) =26646644644a(11) =444446222224