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

Terms

a(0) =0a(1) =1a(2) =2a(3) =9a(4) =24a(5) =81a(6) =234a(7) =729a(8) =2160a(9) =6561a(10) =19602a(11) =59049a(12) =176904a(13) =531441a(14) =1593594a(15) =4782969a(16) =14346720a(17) =43046721a(18) =129133602a(19) =387420489a(20) =1162241784a(21) =3486784401a(22) =10460294154a(23) =31381059609a(24) =94143001680a(25) =282429536481a(26) =847288078002