a(n) = 10^n mod 7^n.

Terms

a(0) =0a(1) =3a(2) =2a(3) =314a(4) =396a(5) =15965a(6) =58808a(7) =117484a(8) =1998383a(9) =31513432a(10) =113366285a(11) =1133662850a(12) =3427321528a(13) =20431928079a(14) =301208291197