Square refactorable numbers.

Terms

a(0) =1a(1) =9a(2) =36a(3) =225a(4) =441a(5) =625a(6) =1089a(7) =1521a(8) =2025a(9) =2601a(10) =3249a(11) =3600a(12) =4761a(13) =5625a(14) =6561a(15) =7569a(16) =8100a(17) =8649a(18) =10000a(19) =12321a(20) =15129a(21) =16641a(22) =19881a(23) =22500a(24) =25281a(25) =26244a(26) =28224a(27) =31329a(28) =32400a(29) =33489