Sigma(n) / d(n) is a perfect square associated with A049226.

Terms

a(0) =36a(1) =144a(2) =196a(3) =400a(4) =900a(5) =1764a(6) =3136a(7) =2304a(8) =3844a(9) =4900a(10) =12100a(11) =7056a(12) =13689a(13) =9216a(14) =6400a(15) =15876a(16) =25600a(17) =44100a(18) =93636a(19) =57600a(20) =32400a(21) =69696a(22) =81796a(23) =94864a(24) =57600a(25) =213444a(26) =72900a(27) =152100a(28) =152100a(29) =360000