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

Terms

a(0) =1a(1) =3a(2) =8a(3) =18a(4) =39a(5) =81a(6) =166a(7) =336a(8) =677a(9) =1359a(10) =2724a(11) =5454a(12) =10915a(13) =21837a(14) =43682a(15) =87372a(16) =174753a(17) =349515a(18) =699040a(19) =1398090a(20) =2796191a(21) =5592393a(22) =11184798a(23) =22369608a(24) =44739229a(25) =89478471a(26) =178956956a(27) =357913926a(28) =715827867a(29) =1431655749