a(n) = Product_{d|n} (n/d + d).

Terms

a(0) =2a(1) =9a(2) =16a(3) =100a(4) =36a(5) =1225a(6) =64a(7) =2916a(8) =600a(9) =5929a(10) =144a(11) =529984a(12) =196a(13) =18225a(14) =16384a(15) =231200a(16) =324a(17) =3538161a(18) =400a(19) =5143824a(20) =48400a(21) =89401a(22) =576a(23) =1482250000a(24) =6760a(25) =164025a(26) =112896a(27) =26050816a(28) =900a(29) =5679280321