Odd squares which are the sum of the divisors of some n.

Terms

a(0) =1a(1) =121a(2) =961a(3) =116281a(4) =294849a(5) =423801a(6) =2989441a(7) =7958041a(8) =26904969a(9) =35676729a(10) =51279921a(11) =71622369a(12) =361722361a(13) =962922961a(14) =1891467081a(15) =1902442689a(16) =3255501249a(17) =4364319969a(18) =4755619521a(19) =5215583961a(20) =6431879601a(21) =6561486009a(22) =6835486329a(23) =7496615889a(24) =8666306649a(25) =9712693809