a(n) = sigma_9(n), the sum of the 9th powers of the divisors of n.

Terms

a(0) =1a(1) =513a(2) =19684a(3) =262657a(4) =1953126a(5) =10097892a(6) =40353608a(7) =134480385a(8) =387440173a(9) =1001953638a(10) =2357947692a(11) =5170140388a(12) =10604499374a(13) =20701400904a(14) =38445332184a(15) =68853957121a(16) =118587876498a(17) =198756808749a(18) =322687697780a(19) =513002215782a(20) =794320419872