Expansion of 1/((1-3*x)*(1-9*x)).

Terms

a(0) =1a(1) =12a(2) =117a(3) =1080a(4) =9801a(5) =88452a(6) =796797a(7) =7173360a(8) =64566801a(9) =581120892a(10) =5230147077a(11) =47071500840a(12) =423644039001