Expansion of x/(1 - 9*x - 4*x^2).

Terms

a(0) =0a(1) =1a(2) =9a(3) =85a(4) =801a(5) =7549a(6) =71145a(7) =670501a(8) =6319089a(9) =59553805a(10) =561260601a(11) =5289560629a(12) =49851088065a(13) =469818035101