Ulam numbers that are perfect squares.

Terms

a(0) =1a(1) =4a(2) =16a(3) =36a(4) =324a(5) =400a(6) =441a(7) =1296a(8) =2809a(9) =2916a(10) =3481a(11) =4624a(12) =4900a(13) =5184a(14) =6889a(15) =11236a(16) =11881a(17) =13689a(18) =17689a(19) =19600a(20) =20736a(21) =21904a(22) =24025a(23) =25921a(24) =34969a(25) =39204a(26) =45796a(27) =47089a(28) =47524a(29) =47961