a(n) = 5*(10^n - 1).

A086576

a(n) = 5*(10^n - 1).

Terms

    a(0) =0a(1) =45a(2) =495a(3) =4995a(4) =49995a(5) =499995a(6) =4999995a(7) =49999995a(8) =499999995a(9) =4999999995a(10) =49999999995a(11) =499999999995

External references