a(n) = 10^n - 9^n + 1^n.

Terms

a(0) =1a(1) =2a(2) =20a(3) =272a(4) =3440a(5) =40952a(6) =468560a(7) =5217032a(8) =56953280a(9) =612579512a(10) =6513215600a(11) =68618940392a(12) =717570463520