Expansion of 1/((1-3*x)*(1-6*x)).

Terms

a(0) =1a(1) =9a(2) =63a(3) =405a(4) =2511a(5) =15309a(6) =92583a(7) =557685a(8) =3352671a(9) =20135709a(10) =120873303a(11) =725416965a(12) =4353033231a(13) =26119793709a(14) =156723545223a(15) =940355620245