a(n) = Sum_{k=1..n} k^3 * tau(k), where tau is A000005.

Terms

a(0) =1a(1) =17a(2) =71a(3) =263a(4) =513a(5) =1377a(6) =2063a(7) =4111a(8) =6298a(9) =10298a(10) =12960a(11) =23328a(12) =27722a(13) =38698a(14) =52198a(15) =72678a(16) =82504a(17) =117496a(18) =131214a(19) =179214a(20) =216258a(21) =258850a(22) =283184a(23) =393776a(24) =440651a(25) =510955a(26) =589687a(27) =721399a(28) =770177a(29) =986177