a(n) = 5*(10^n - 2).

A177096

a(n) = 5*(10^n - 2).

Terms

    a(0) =40a(1) =490a(2) =4990a(3) =49990a(4) =499990a(5) =4999990a(6) =49999990a(7) =499999990a(8) =4999999990a(9) =49999999990a(10) =499999999990

External references