Floor((10^n)/(log(10^n) - 1)).

Terms

a(0) =7a(1) =27a(2) =169a(3) =1217a(4) =9512a(5) =78030a(6) =661458a(7) =5740303a(8) =50701542a(9) =454011971a(10) =4110416300a(11) =37550193649a(12) =345618860220