a(n) = 10*7^n+1.

Terms

a(0) =11a(1) =71a(2) =491a(3) =3431a(4) =24011a(5) =168071a(6) =1176491a(7) =8235431a(8) =57648011a(9) =403536071a(10) =2824752491a(11) =19773267431a(12) =138412872011a(13) =968890104071