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

Terms

a(0) =1a(1) =6a(2) =27a(3) =110a(4) =429a(5) =1638a(6) =6187a(7) =23238a(8) =87021a(9) =325358a(10) =1215435a(11) =4538430a(12) =16942381a(13) =63239286a(14) =236031147a(15) =880918070a(16) =3287706669a(17) =12270039678a(18) =45792714187a(19) =170901341358a(20) =637813699821