Squares composed of digits {1,4,8}.

Terms

a(0) =1a(1) =4a(2) =81a(3) =144a(4) =441a(5) =484a(6) =841a(7) =1444a(8) =11881a(9) =14884a(10) =48841a(11) =1418481a(12) =414488881