Expansion of (1-4x)/((1-5x)(1-6x)).

Terms

a(0) =1a(1) =7a(2) =47a(3) =307a(4) =1967a(5) =12427a(6) =77687a(7) =481747a(8) =2968607a(9) =18202267a(10) =111166727a(11) =676765987a(12) =4109424047a(13) =24900684907a(14) =150624812567a(15) =909852391027