a(n) = floor(n^(1/n)*10^n).

Terms

a(0) =10a(1) =141a(2) =1442a(3) =14142a(4) =137972a(5) =1348006a(6) =13204692a(7) =129683955a(8) =1276518007a(9) =12589254117a(10) =124357522791