a(n) = floor(10^n/n).

Terms

a(0) =10a(1) =50a(2) =333a(3) =2500a(4) =20000a(5) =166666a(6) =1428571a(7) =12500000a(8) =111111111a(9) =1000000000a(10) =9090909090a(11) =83333333333a(12) =769230769230