Expansion of (1-2x)^2/((1-3x)(1-4x)).

Terms

a(0) =1a(1) =3a(2) =13a(3) =55a(4) =229a(5) =943a(6) =3853a(7) =15655a(8) =63349a(9) =255583a(10) =1028893a(11) =4135255a(12) =16600069a(13) =66577423a(14) =266841133a(15) =1068958855a(16) =4280618389a(17) =17136822463a(18) =68590336573a(19) =274490486455