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

Terms

a(0) =1a(1) =4a(2) =11a(3) =27a(4) =66a(5) =161a(6) =389a(7) =940a(8) =2271a(9) =5483a(10) =13238a(11) =31961a(12) =77161a(13) =186284a(14) =449731a(15) =1085747a(16) =2621226a(17) =6328201a(18) =15277629a(19) =36883460a(20) =89044551a(21) =214972563a(22) =518989678a(23) =1252951921a(24) =3024893521a(25) =7302738964a(26) =17630371451a(27) =42563481867a(28) =102757335186