Odd refactorable numbers.

Terms

a(0) =1a(1) =9a(2) =225a(3) =441a(4) =625a(5) =1089a(6) =1521a(7) =2025a(8) =2601a(9) =3249a(10) =4761a(11) =5625a(12) =6561a(13) =7569a(14) =8649a(15) =12321a(16) =15129a(17) =16641a(18) =19881a(19) =25281a(20) =31329a(21) =33489a(22) =35721a(23) =40401a(24) =45369a(25) =47961a(26) =50625a(27) =56169a(28) =62001a(29) =71289