a(n) = sigma_10(n^2)/sigma_5(n^2).

Terms

a(0) =1a(1) =993a(2) =58807a(3) =1016801a(4) =9762501a(5) =58395351a(6) =282458443a(7) =1041204193a(8) =3472494301a(9) =9694163493a(10) =25937263551a(11) =59795016407a(12) =137858120557a(13) =280481233899a(14) =574103396307