Squares composed of digits {1,4,6}.

Terms

a(0) =1a(1) =4a(2) =16a(3) =64a(4) =144a(5) =441a(6) =1444a(7) =11664a(8) =14161a(9) =14641a(10) =16641a(11) =41616a(12) =166464a(13) =646416a(14) =6441444a(15) =11614464a(16) =44116164a(17) =166616464a(18) =664144441a(19) =6114614416a(20) =6661661161a(21) =111461164164