a(n) = 3*(10^n-1).

A083813

a(n) = 3*(10^n-1).

Terms

    a(0) =27a(1) =297a(2) =2997a(3) =29997a(4) =299997a(5) =2999997a(6) =29999997a(7) =299999997a(8) =2999999997a(9) =29999999997a(10) =299999999997

External references