a(n) = floor(n^(1/2)*10^n).

Terms

a(0) =10a(1) =141a(2) =1732a(3) =20000a(4) =223606a(5) =2449489a(6) =26457513a(7) =282842712a(8) =3000000000a(9) =31622776601a(10) =331662479035