Squares in A037159.

Terms

a(0) =21609a(1) =27889a(2) =54289a(3) =1461681a(4) =6610041a(5) =8037225a(6) =25250625a(7) =39778249a(8) =50908225a(9) =60637369a(10) =171321921a(11) =207504025a(12) =218123361a(13) =307265841a(14) =315808441a(15) =380367009a(16) =435598641a(17) =437353569a(18) =528126361a(19) =561073969a(20) =581340321a(21) =708890625a(22) =877285161