a(n) = 10*a(n-1) - a(n-2) for n > 1, a(0) = a(1) = 1.

A072256

a(n) = 10*a(n-1) - a(n-2) for n > 1, a(0) = a(1) = 1.

Terms

    a(0) =1a(1) =1a(2) =9a(3) =89a(4) =881a(5) =8721a(6) =86329a(7) =854569a(8) =8459361a(9) =83739041a(10) =828931049a(11) =8205571449a(12) =81226783441a(13) =804062262961

External references