a(n) = 9a(n-1) - 9a(n-2) + a(n-3).

Terms

a(0) =10a(1) =34a(2) =250a(3) =1954a(4) =15370a(5) =120994a(6) =952570a(7) =7499554a(8) =59043850a(9) =464851234a(10) =3659766010a(11) =28813276834a(12) =226846448650