Expansion of g.f. x/(1 - 9*x - 2*x^2).

Terms

a(0) =0a(1) =1a(2) =9a(3) =83a(4) =765a(5) =7051a(6) =64989a(7) =599003a(8) =5521005a(9) =50887051a(10) =469025469a(11) =4323003323a(12) =39845080845a(13) =367251734251