a(n) = sigma_2(n) + 3 sigma(n) tau(n) + tau(n)^3.

Terms

a(0) =5a(1) =31a(2) =42a(3) =111a(4) =70a(5) =258a(6) =106a(7) =329a(8) =235a(9) =410a(10) =202a(11) =930a(12) =262a(13) =602a(14) =612a(15) =931a(16) =406a(17) =1373a(18) =490a(19) =1518a(20) =948a(21) =1106a(22) =682a(23) =2802a(24) =957a(25) =1418a(26) =1364a(27) =2274a(28) =1030a(29) =3540