Sum of divisors of 10^n.

Terms

a(0) =1a(1) =18a(2) =217a(3) =2340a(4) =24211a(5) =246078a(6) =2480437a(7) =24902280a(8) =249511591a(9) =2497558338a(10) =24987792457a(11) =249938963820